Re-add logic for empty model

apps/opencs/view/render/object.cpp

@@ -124,11 +124,15 @@ void CSVRender::Object::update()
             mActor->update();
             mBaseNode->addChild(mActor->getBaseNode());
         }
-        else
+        else if (!model.empty())
         {
             std::string path = "meshes\\" + model;
             mResourceSystem->getSceneManager()->getInstance(path, mBaseNode);
         }
+        else
+        {
+            throw std::runtime_error(mReferenceableId + " has no model");
+        }
     }
     catch (std::exception& e)
     {