[bisq-network/bisq] Error when try to take offer (mediatorNodeAddress must not be null) (#3614)

[beingindot]

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### Description
Error popup coming when bob trying to take offer created by alice.

<!-- brief description of the bug -->

#### Version
<!-- commit id or version number -->

### Steps to reproduce
1. put buy btc offer with usd from alice
2. take that offer from bob
3. confirm everything and sell btc
4. during final confirm, error popup coming for alice
5. after sometime, error popup coming for bob as well.

<!--if you can reliably reproduce the bug, list the steps here  -->

### Expected behaviour
We should be able to take offer without error
<!--description of the expected behavior -->

### Actual behaviour
while taking offer error popup coming
<!-- explain what happened instead of the expected behaviour -->

### Screenshots
![Screenshot from 2019-11-15 16-02-44](https://user-images.githubusercontent.com/55691179/68955436-05405580-07ec-11ea-9ff2-664c770a1987.png)

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#### Device or machine
Ubuntu 18.04
<!-- device/machine used, operating system -->



#### Additional info

<!-- Additional information useful for debugging (e.g. logs) -->


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https://github.com/bisq-network/bisq/issues/3614
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