Separate open_channel dialog. In open_channel_coroutine, use host and port from channel announcements

electrum/network.py

@@ -300,6 +300,7 @@ class Network(Logger):
         self._set_status('disconnected')
 
         # lightning network
+        self.lightning_nodes = {}
         self.channel_db = lnrouter.ChannelDB()
         self.path_finder = lnrouter.LNPathFinder(self.channel_db)
         self.lnwatcher = lnwatcher.LNWatcher(self)