catching audio error when closing headless tnc

tnc/modem.py

@@ -569,6 +569,7 @@ class RF:
         :rtype: int
         """
         nbytes = 0
+        try:
             while self.stream.active:
                 threading.Event().wait(0.01)
                 while audiobuffer.nbuffer >= nin:
@@ -585,6 +586,8 @@ class RF:
                         self.modem_received_queue.put([bytes_out, freedv, bytes_per_frame])
                         self.get_scatter(freedv)
                         self.calculate_snr(freedv)
+        except Exception as e:
+            self.log.warning("[MDM] [demod_audio] Stream not active anymore", e=e)
         return nin
 
     def init_codec2_mode(self, mode, adv):