[bisq-network/bisq] Fix remaining blackmail vulnerabilities (#4789)

[Christoph Atteneder]

I just saw in Travis that there are two failing tests right now:
```
bisq.core.offer.OpenOfferManagerTest > testStartEditOfferForActiveOffer FAILED
    java.lang.RuntimeException at OpenOfferManagerTest.java:45
bisq.core.offer.OpenOfferManagerTest > testStartEditOfferForOfferThatIsCurrentlyEdited FAILED
    java.lang.RuntimeException at OpenOfferManagerTest.java:106
```

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