bug fix for asr_launch empty speech (#709)

funasr/bin/asr_inference_launch.py

@@ -619,6 +619,22 @@ def inference_paraformer_vad_punc(
             sorted_data = sorted(data_with_index, key=lambda x: x[0][1] - x[0][0])
             results_sorted = []
             
+            if not len(sorted_data):
+                key = keys[0]
+                # no active segments after VAD
+                if writer is not None:
+                    # Write empty results
+                    ibest_writer["token"][key] = ""
+                    ibest_writer["token_int"][key] = ""
+                    ibest_writer["vad"][key] = ""
+                    ibest_writer["text"][key] = ""
+                    ibest_writer["text_with_punc"][key] = ""
+                    if use_timestamp:
+                        ibest_writer["time_stamp"][key] = ""
+
+                logging.info("decoding, utt: {}, empty speech".format(key))
+                continue
+
             batch_size_token_ms = batch_size_token*60
             if speech2text.device == "cpu":
                 batch_size_token_ms = 0