[bisq-network/bisq] Check Monero tx message when buying XMR (#1555)

[kopite77]

@ManfredKarrer @ripcurlx I encountered this issue again in v0.8.0. Please see attachment. 
![screenshot](https://user-images.githubusercontent.com/34752465/48305488-1de2a500-e4e0-11e8-88c0-33dc7ad34196.png)


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