DOC: Add TODO for ambiguous container retrieval

src/caosdb/common/models.py

@@ -1039,6 +1039,8 @@ class Entity(object):
 
                 return c[0]
             else:
+                # TODO: This has to be chnaged once ambiguous
+                # retrievals are delat with server-side.
                 raise QueryNotUniqueError("This retrieval was not unique!!!")
         else:
             return Container().append(self).retrieve(