add a silence instead of none

app.py

@@ -466,6 +466,11 @@ def generate_speech(history):
                     wait_time = AUDIO_WAIT_MODIFIER * wait_time
                     print("Sleeping till audio end")
                     time.sleep(wait_time)
+                else:
+                    # Either too much text or some programming, give a silence so stream continues
+                    second_of_silence = AudioSegment.silent()  # use default
+                    second_of_silence.export("sil.wav", format="wav")
+                    yield (gr.Audio.update(value="sil.wav", autoplay=True), history)
 
         except RuntimeError as e:
             if "device-side assert" in str(e):