actor: On removePart, clean up the part's commonBundleHandle.
actor: On removePart, clean up the part's commonBundleHandle.

Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d,Wilee999/panda3d