UI / Layout scripts:
* Code cleanup for new Rigid Body panels. 
* Removed some unneeded split() calls.
* Remove redundant check for "ob.rigid_body_constraint" in the draw() function of the "Rigid Body Constraint" panel. The check is already made in the poll. 


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54037 954f8c5b-7b00-dc11-b283-0030488c597c