fixed observation,

fixed observer reporting

marl_factory_grid/environment/groups/objects.py

@@ -60,7 +60,7 @@ class Objects:
         return self
 
     def remove_item(self, item: _entity):
-        for observer in self.observers:
+        for observer in item.observers:
             observer.notify_del_entity(item)
         # noinspection PyTypeChecker
         del self._data[item.name]
@@ -147,10 +147,6 @@ class Objects:
     #             pass
 
     def notify_del_entity(self, entity: Object):
-        try:
-            entity.del_observer(self)
-        except AttributeError:
-            pass
         try:
             self.pos_dict[entity.pos].remove(entity)
         except (AttributeError, ValueError, IndexError):