update the init flag, test=doc

paddlespeech/server/engine/asr/online/asr_engine.py

@@ -738,6 +738,8 @@ class ASRServerExecutor(ASRExecutor):
             self.searcher = CTCPrefixBeamSearch(self.config.decode)
             self.transformer_decode_reset()
             
+        return True
+
     def reset_decoder_and_chunk(self):
         """reset decoder and chunk state for an new audio
         """