Classification fixes (#17337)

* Cleanup classification settings behavior

* Cleanup response

* restore

frigate/embeddings/maintainer.py

@@ -206,12 +206,15 @@ class EmbeddingMaintainer(threading.Thread):
                             self.embeddings.embed_description("", data, upsert=False),
                             pack=False,
                         )
+
                 processors = [self.realtime_processors, self.post_processors]
                 for processor_list in processors:
                     for processor in processor_list:
                         resp = processor.handle_request(topic, data)
                         if resp is not None:
                             return resp
+
+                return None
             except Exception as e:
                 logger.error(f"Unable to handle embeddings request {e}", exc_info=True)