Fix client error, missing raising exception

Author: hoijnet

terminusdb_client/schema/schema.py

@@ -53,7 +53,7 @@ def __init__(self, keys: Union[str, list, None] = None):
             elif isinstance(keys, list):
                 self._keys = keys
             else:
-                ValueError(f"keys need to be either str or list but got {keys}")
+                raise ValueError(f"keys need to be either str or list but got {keys}")
 
 
 class HashKey(TerminusKey):