[TIMOB-11428] [TIMOB-11401] Added better error messages for trying to remove or getting a non-existent config key.
[TIMOB-11428] [TIMOB-11401] Added better error messages for trying to remove or getting a non-existent config key.

cheekiatng/titanium,titanium-forks/appcelerator.titanium,FokkeZB/titanium,cheekiatng/titanium,titanium-forks/appcelerator.titanium,FokkeZB/titanium,cheekiatng/titanium,salem/titanium,FokkeZB/titanium,salem/titanium,salem/titanium,titanium-forks/appcelerator.titanium