[bisq-network/bisq] Reduce initial data request (#4586)

[chimp1984]

@chimp1984 commented on this pull request.



> +        if (anyMapContainsKey(hash)) {
+            return null;
+        }
+
+        PersistableNetworkPayload previous = getMapOfLiveData().put(hash, payload);

Yes it will be always null, but we override the method signature from MapStoreService and follow the putIfAbsent signature from Map. In our special case it wil be always null. I can change it to make it more clear and add a comment. 

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