Fix [#34920] Hit Spacebar, search for freestyle, click Move Freestyle Module - crash

Simply add a poll func to (re)move freestyle module ops, to check whether we actually have an active module in context.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55896 954f8c5b-7b00-dc11-b283-0030488c597c