Mark packets as acked in MsgTracker

This patch updates webchat to track the msgs recieved as tracked
and acked, so the TX thread can stop trying to send.

aprsd/cmds/webchat.py

@@ -244,6 +244,8 @@ class WebChatTXThread(aprsd_thread.APRSDThread):
         LOG.info(f"We got ack for our sent message {ack_num}")
         messaging.log_packet(packet)
         SentMessages().ack(int(ack_num))
+        tracker = messaging.MsgTrack()
+        tracker.remove(ack_num)
         self.socketio.emit(
             "ack", SentMessages().get(int(ack_num)),
             namespace="/sendmsg",

aprsd/threads/rx.py

@@ -102,7 +102,8 @@ class APRSDProcessPacketThread(APRSDThread):
         # We don't put ack packets destined for us through the
         # plugins.
         if (
-            tocall.lower() == self.config["aprsd"]["callsign"].lower()
+            tocall
+            and tocall.lower() == self.config["aprsd"]["callsign"].lower()
             and msg_response == "ack"
         ):
             self.process_ack_packet(packet)