1. add null check on accessibility service
2. handle widget locker events correctly. (i hope)
untested yet.

git-svn-id: http://notifications-widget.googlecode.com/svn/trunk@198 21922344-3934-ee51-d6e3-fd981ce84c01
fixed widgetlocker clear on unlock

git-svn-id: http://notifications-widget.googlecode.com/svn/trunk@199 21922344-3934-ee51-d6e3-fd981ce84c01