set m_parent to nullptr when removing child from a container

src/scene/containernode.cpp

@@ -26,6 +26,7 @@ void ContainerNode::removeChild(SceneNode* node)
             if(*it == node)
             {
                 m_children.erase(it);
+                node->m_parent = nullptr;
 //                break;
             }
         }

src/scene/graphicalcontainernode.cpp

@@ -32,8 +32,8 @@ void GraphicalContainerNode::removeChild(GraphicalNode *node)
             if(*it == node)
             {
                 m_children.erase(it);
+                node->m_parent = nullptr;
             }
         }
     }
-
 }

src/scene/meshnode.h

@@ -13,7 +13,6 @@ class btIndexedMesh;
  */
 
 class MeshNode : public GraphicalNode
-
 {
     GeometryNode m_geometry;
     btIndexedMesh *bulletMesh;