Fixed enable and disable not to allow ValueError through their makeAntiCapability calls.
Fixed enable and disable not to allow ValueError through their makeAntiCapability calls.

mazaclub/mazabot-core,haxwithaxe/supybot,frumiousbandersnatch/supybot-code,ProgVal/Limnoria-test,buildbot/supybot,raboof/supybot,jeffmahoney/supybot,prashantpawar/supybot-rothbot,ProgVal/Limnoria-test,Ban3/Limnoria,Ban3/Limnoria,kblin/supybot-gsoc,mazaclub/mazabot-core