Don't try to send through closed socket in NodeDiscovery #82
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When stopping the services, and PeerManager is still alive after NodeDiscovery was stopped, it may try to send some discovery messages. This will cause DatagramServer.sendto to throw AttributeError, because a closed DatagramServer doesn't have a `socket` attribute. Prevent this, by checking if the DatagramServer is closed, and dropping the message if it is.
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When stopping the services, and PeerManager is still alive after
NodeDiscovery was stopped, it may try to send some discovery messages.
This will cause DatagramServer.sendto to throw AttributeError, because
a closed DatagramServer doesn't have a
socketattribute.Prevent this, by checking if the DatagramServer is closed, and dropping
the message if it is.