Failed Failed to run : undefined
### How did it happen?
1. I click any button of sketch git function, all  response " Failed Failed to run : undefined"
2.
3.


### Error log

```
Failed to run: undefined

{
	"pid": "26068",
	"status": 72,
	"stdout": ""
}

@/Users/kate.lin/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/__commands_Add.js:1:10567
@/Users/kate.lin/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/__commands_Add.js:1:15862
c@/Users/kate.lin/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/__commands_Add.js:1:20189
@/Users/kate.lin/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/__commands_Add.js:1:21330
@/Users/kate.lin/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/__commands_Add.js:1:21269
@/Users/kate.lin/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/__commands_Add.js:1:21302
__skpm_run@/Users/kate.lin/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Git.sketchplugin/Contents/Sketch/__commands_Add.js:1:21607
__skpm_run@[native code]
```