[bisq-network/bisq] Cannot take fiat offer with very low amount if not having a signed witness (#4617)

[chimp1984]

<!--
   SUPPORT REQUESTS: This is for reporting bugs in the Bisq app.
   If you have a support request, please join #support on Bisq's
   Keybase team at https://keybase.io/team/Bisq
-->

### Description

I tried to take an offer with 0.001 BTC from a new dev app with a new AliPay account. Not account witness signed.
Got greyed out offer and popup that i cannot take offer. 

#### Version

1.4.0

#### Additional info

At debugging it seem the verifyPeersTradeLimit is not called as there is no witness found and we return false in that case.
```
   public boolean verifyPeersTradeAmount(Offer offer,
                                          Coin tradeAmount,
                                          ErrorMessageHandler errorMessageHandler) {
        checkNotNull(offer);
        return findWitness(offer)
                .map(witness -> verifyPeersTradeLimit(offer, tradeAmount, witness, new Date(), errorMessageHandler))
                .orElse(false);
    }
```

@sqrrm Can you have a look?

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/bisq-network/bisq/issues/4617
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bisq.network/pipermail/bisq-github/attachments/20201010/fd1a6b6b/attachment.html>