typo

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@43563 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/MultiRelationField.py

@@ -421,7 +421,7 @@ class MultiRelationEditor:
       return self.__dict__
 
     def edit(self, o):
-      if self.relation_editor_list != None:
+      if self.relation_editor_list is not None:
 
         relation_object_list = []
         for value, uid, display_text, relation_key, item_key in \