[bisq-network/bisq] Small improvements/fixes (#1728)

[Manfred Karrer]

@ManfredKarrer pushed 2 commits.

dbe0993  Fix nullpointer
29193ad  Fix failing test


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View it on GitHub:
https://github.com/bisq-network/bisq/pull/1728/files/8eabd665c79a1a7a8148e0e9fd3fc6eb5db96176..29193ad9283ac186343ea63fcc1c3568740b0e78
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