[bisq-network/bisq] Added graceful shutdown hook (#4047)

[Christoph Atteneder]

@ripcurlx commented on this pull request.



> @@ -187,6 +187,7 @@ private BooleanProperty torNetworkNodeShutDown() {
                 long ts = System.currentTimeMillis();
                 log.debug("Shutdown torNetworkNode");
                 try {
+                    if (tor == null) tor = Tor.getDefault();

NIT: I think we decided at some point not to use conditionals within one line anymore

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