Error at each workbench change

[0penBrain]

ShortCuts/InitGui.py

Line 238 in 314be70

index = paramGet.GetGroup("Global shortcuts").GetString("IndexList")

Each time I change workbench, I see this error :

Traceback (most recent call last):
  File "<string>", line 739, in applyShortcuts
  File "<string>", line 245, in globalShortcuts
ValueError: Empty group name

This is due to 'IndexList' being empty, thus it's returned as '' (empty string) -- that just after is transformed in a list containing a single value equal to empty string due to split.
I guess it could be good after the mentioned line to check if index is an empty string and immediately return if it's the case.

This said, I don't know how this arised.

[RushOnline]

@0penBrain I've created pull request with fix: #12

Also I see this error when press Shift+Q within 0.20 clean install + this mod.