Minor warning cleanup & fix

- comment/remove assignments from values to themselves.
- add case break statements (no functional change but some source code checkers notice).
- fix python errors when the sculpt brush is None.

source/gameengine/Physics/Bullet/CcdPhysicsController.cpp

@@ -2142,6 +2142,7 @@ btCollisionShape* CcdShapeConstructionInfo::CreateBulletShape(btScalar margin, b
 			}
 			collisionShape = compoundShape;
 		}
+		break;
 	}
 	return collisionShape;
 }