fix asserts on domain switch

libraries/entities/src/EntityItem.cpp

@@ -62,7 +62,7 @@ EntityItem::EntityItem(const EntityItemID& entityItemID) :
 EntityItem::~EntityItem() {
     // these pointers MUST be correct at delete, else we probably have a dangling backpointer
     // to this EntityItem in the corresponding data structure.
-    assert(!_simulated);
+    assert(!_simulated || (!_element && !_physicsInfo));
     assert(!_element);
     assert(!_physicsInfo);
 }

libraries/physics/src/PhysicalEntitySimulation.cpp

@@ -158,7 +158,6 @@ void PhysicalEntitySimulation::clearEntitiesInternal() {
         EntityMotionState* motionState = static_cast<EntityMotionState*>(&(*stateItr));
         assert(motionState);
         EntityItemPointer entity = motionState->getEntity();
-        entity->setPhysicsInfo(nullptr);
         // TODO: someday when we invert the entities/physics lib dependencies we can let EntityItem delete its own PhysicsInfo
         // until then we must do it here
         delete motionState;