fix(processor): specialized processors respect contract by raising if none (#1909)

* fix(processor): specialized processor now raise

* test(processor): fix tests for now raise specialized processors

* test(processor): use identity in newly introduced pipeline

tests/processor/test_rename_processor.py

@@ -86,7 +86,7 @@ def test_none_observation():
     """Test processor with None observation."""
     processor = RenameObservationsProcessorStep(rename_map={"old": "new"})
 
-    transition = create_transition()
+    transition = create_transition(observation={})
     result = processor(transition)
 
     # Should return transition unchanged