src/callbacks: Remove a duplicate except statement.
src/callbacks: Remove a duplicate except statement.

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