problem with empty "NIMX_RES_PATH"
I get an error when compiling the any code sample with nimx:
`stack trace: (most recent call last)
nimx/resource_cache.nim(140) getResourceNames
nimx/resource_cache.nim(128) getEnvCt
lib/pure/strutils.nim(2242) removeSuffix
lib/pure/strutils.nim(2242, 9) Error: index out of bounds`

This problem disappears when I use
$ export NIMX_RES_PATH="123"