Handled case in last where argument isn't an integer.
Handled case in last where argument isn't an integer.

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