lang#plantuml layer does not install open-browser.vim dependency
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## Expected behavior, english is required

Fresh install of SpaceVim on top of Fresh install of neovim

Add following layer to init.toml:

```
cat ~/.SpaceVim.d/init.toml                     
#=============================================================================
# dark_powered.toml --- dark powered configuration example for SpaceVim
# Copyright (c) 2016-2022 Wang Shidong & Contributors
# Author: Wang Shidong < wsdjeg at 163.com >
# URL: https://spacevim.org
# License: GPLv3
#=============================================================================

# All SpaceVim option below [option] section
[options]
    # set spacevim theme. by default colorscheme layer is not loaded,
    # if you want to use more colorscheme, please load the colorscheme
    # layer
    colorscheme = "gruvbox"
    colorscheme_bg = "dark"
    # Disable guicolors in basic mode, many terminal do not support 24bit
    # true colors
    enable_guicolors = true
    # Disable statusline separator, if you want to use other value, please
    # install nerd fonts
    statusline_separator = "arrow"
    statusline_iseparator = "arrow"
    buffer_index_type = 4
    enable_tabline_filetype_icon = true
    enable_statusline_mode = false

# Enable autocomplete layer
[[layers]]
name = 'autocomplete'
auto_completion_return_key_behavior = "complete"
auto_completion_tab_key_behavior = "smart"

[[layers]]
name = 'shell'
default_position = 'top'
default_height = 30

[[layers]]
name = 'lang#plantuml'
plantuml_jar_path = '/usr/local/Cellar/plantuml/1.2022.1/libexec/plantuml.jar'
```
Open neovim and edit uml
Run :PlantumlOpen and see output of uml rendered by plantuml

## The reproduce ways from Vim starting (Required!)
Open neovim and edit uml
Run `:PlantumlOpen`
```
Error detected while processing function plantuml_previewer#open:
line    2:
require open-browser.vim
```

## Output of the `:SPDebugInfo!`
```
<details><summary> SpaceVim debug information </summary>

### SpaceVim options :

```toml
  auto_disable_touchpad = 1
  autocomplete_method = 'asyncomplete'
  autocomplete_parens = 1
  buffer_index_type = 4
  checkinstall = 1
  code_runner_focus = 0
  colorscheme = 'gruvbox'
  colorscheme_bg = 'dark'
  colorscheme_default = 'desert'
  commandline_prompt = '➭'
  custom_color_palette = []
  custom_plugins = []
  data_dir = '/Users/sanforj/.cache/'
  debug_level = 1
  default_custom_leader = '<Space>'
  default_indent = 2
  disabled_plugins = []
  enable_bepo_layout = 0
  enable_cursorcolumn = 0
  enable_cursorline = 1
  enable_debug = 0
  enable_googlesuggest = 0
  enable_guicolors = 1
  enable_javacomplete2_py = 0
  enable_key_frequency = 0
  enable_language_specific_leader = 1
  enable_neocomplcache = 0
  enable_os_fileformat_icon = 0
  enable_powerline_fonts = 1
  enable_projects_cache = 1
  enable_statusline_bfpath = 0
  enable_statusline_mode = 0
  enable_statusline_tag = 1
  enable_tabline_filetype_icon = 1
  enable_tabline_ft_icon = 0
  enable_vimfiler_welcome = 1
  enable_ycm = 0
  error_symbol = '✖'
  escape_key_binding = 'jk'
  expand_tab = 1
  file_searching_tools = []
  filemanager = 'nerdtree'
  filetree_direction = 'right'
  filetype_icons = {}
  force_global_config = 0
  gitcommit_issue_icon = ''
  gitcommit_pr_icon = ''
  github_username = ''
  guifont = ''
  hiddenfileinfo = 1
  home_files_number = 6
  hosts_url = 'https://raw.githubusercontent.com/racaljk/hosts/master/hosts'
  info_symbol = 'ⓘ'
  keep_server_alive = 1
  language = ''
  leader_guide_default_group_name = ''
  leader_guide_flatten = 1
  leader_guide_hspace = 5
  leader_guide_max_size = 0
  leader_guide_position = 'botright'
  leader_guide_run_map_on_popup = 1
  leader_guide_sort_horizontal = 0
  leader_guide_submode_mappings = {'<C-C>': 'win_close'}
  leader_guide_vertical = 0
  lint_engine = 'neomake'
  lint_on_save = 1
  lint_on_the_fly = 0
  max_column = 120
  plugin_bundle_dir = '/Users/sanforj/.cache/vimfiles/'
  plugin_manager = 'dein'
  plugin_manager_processes = 16
  plugin_name = 'vim-slumlord'
  project_auto_root = 1
  project_rooter_outermost = 1
  project_rooter_patterns = ['.git/', '_darcs/', '.hg/', '.bzr/', '.svn/', '.SpaceVim.d/']
  projects_cache_num = 20
  realtime_leader_guide = 1
  relativenumber = 1
  search_tools = ['rg', 'ag', 'pt', 'ack', 'grep', 'findstr', 'git']
  sidebar_direction = ''
  sidebar_width = 30
  smartcloseignoreft = ['tagbar', 'vimfiler', 'defx', 'SpaceVimRunner', 'SpaceVimREPL', 'SpaceVimQuickFix', 'HelpDescribe', 'VebuggerShell', 'VebuggerTerminal', 'SpaceVimTabsManager']
  smartcloseignorewin = ['__Tagbar__', 'vimfiler:default']
  snippet_engine = 'neosnippet'
  src_root = 'E:\sources\'
  statusline_iseparator = 'arrow'
  statusline_left_sections = ['winnr', 'filename', 'major mode', 'search count', 'syntax checking', 'minor mode lighters']
  statusline_right_sections = ['fileformat', 'cursorpos', 'percentage']
  statusline_separator = 'arrow'
  statusline_unicode = 1
  terminal_cursor_shape = 2
  todo_labels = ['@fixme', '@question', '@todo', '@idea']
  update_retry_cnt = 3
  version = '2.0.0-dev'
  vim_help_language = 'en'
  vimcompatible = 0
  warning_symbol = '⚠'
  wildignore = '*/tmp/*,*.so,*.swp,*.zip,*.class,tags,*.jpg,*.ttf,*.TTF,*.png,*/target/*,.git,.svn,.hg,.DS_Store,*.svg'
  windisk_encoding = 'cp936'
  windows_index_type = 3
  windows_leader = 's'
  windows_smartclose = 'q'
  wrap_line = 0
```


### SpaceVim layers :

```toml
[[layers]]
  name="autocomplete"
  auto_completion_return_key_behavior='complete'
  auto_completion_tab_key_behavior='smart'
[[layers]]
  name="checkers"
[[layers]]
  name="format"
[[layers]]
  name="edit"
[[layers]]
  name="ui"
[[layers]]
  name="core"
[[layers]]
  name="core#banner"
[[layers]]
  name="core#statusline"
[[layers]]
  name="core#tabline"
[[layers]]
  name="shell"
  default_position='top'
  default_height=30
[[layers]]
  name="lang#plantuml"
  plantuml_jar_path='/usr/local/Cellar/plantuml/1.2022.1/libexec/plantuml.jar'
```


### SpaceVim Health checking :

SpaceVim clipboard support check report:
Checking +clipboard:
      SUCCEED!
SpaceVim environment check report:
Current progpath: nvim(/usr/local/Cellar/neovim/0.6.1/bin/nvim)
version: 800
OS: mac
[shell, shellcmdflag, shellslash]: ['/bin/zsh', '-c', 0]
SpaceVim lua support check report:
Checking +lua:
      Failed : Known issue, neovim do not support lua now.
SpaceVim python support check report:
Checking +python3:
      Failed : to support +python3, you need run `pip3 install neovim`
Checking +python:
      Failed : to support +python, you need run `pip2 install neovim`

### SpaceVim runtime log :

```log
[ SpaceVim ] : logger file  does not exists, only log for current process will be shown!
[ SpaceVim ] [14:07:07] [0.001] [  Info ] Loading SpaceVim from: /Users/sanforj/.SpaceVim/
[ SpaceVim ] [14:07:07] [0.471] [  Info ] Startup with argv: ['nvim', '/Users/sanforj/foo.uml']
[ SpaceVim ] [14:07:07] [0.487] [  Info ] start loading global config >>>
[ SpaceVim ] [14:07:07] [0.487] [  Info ] global_dir is: /Users/sanforj/.SpaceVim.d/
[ SpaceVim ] [14:07:07] [0.487] [  Info ] start to apply config [glob]
[ SpaceVim ] [14:07:07] [0.490] [  Info ] find local conf: /Users/sanforj/.SpaceVim.d/init.toml
[ SpaceVim ] [14:07:07] [0.490] [  Info ] loading cached local conf: /Users/sanforj/.cache/SpaceVim/conf/_Users_sanforj__SpaceVim_d_init_toml.json
[ SpaceVim ] [14:07:07] [0.490] [  Info ] start to apply config [local]
[ SpaceVim ] [14:07:07] [0.495] [  Info ] SpaceVim server startup at:/tmp/spacevim_nvim_server
[ SpaceVim ] [14:07:07] [0.542] [  Info ] the func has been added to mode:syntax-checking
[ SpaceVim ] [14:07:07] [0.576] [  Info ] the func has been added to mode:spell-checking
[ SpaceVim ] [14:07:07] [0.576] [  Info ] the func has been added to mode:paste-mode
[ SpaceVim ] [14:07:07] [0.628] [  Info ] finished loading SpaceVim!
[   rooter ] [14:07:08] [0.764] [  Info ] Load projects cache from: /Users/sanforj/.cache/SpaceVim/projects.json
```
</details>
```
## Screenshots

<img width="562" alt="image" src="https://user-images.githubusercontent.com/108698/156826562-8dd54166-3afb-42be-87ef-77f557df1300.png">

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