don't crash in case a frame cannot be sent

utils/blphub.py

@@ -69,7 +69,11 @@ class BLPHub():
                 self.__lastFrameTimeout = (
                     currentTime + self.__streams[stream]['timeout']
                     )
+                try:
                     self.__output.sendFrame(frame)
+                except Exception as e:
+                    # TODO better error handling
+                    print('could not send frame: %s' % (repr(e)))
                 return True
 
         return False