ENH: Introduce AmbiguousEntityError

src/caosdb/exceptions.py

@@ -347,3 +347,10 @@ class AuthorizationException(EntityError):
     Maybe you need more privileges or a user account at all.
 
     """
+
+
+class AmbiguousEntityError(EntityError):
+    """A retrieve of the entity was not possible because there is more
+    than one possible candidate.
+
+    """