[bisq-network/bisq] Fix exception in offer entry UI (#5753)

[jmacxx]

Fixes an exception in offer entry when fixed prices are used.

## Steps to reproduce issue:

First, select the option of fixed price:

![image](https://user-images.githubusercontent.com/47253594/137216068-b44c0941-232d-4877-a946-004db3a08a8a.png)

- Click on create offer to Buy.
- Select the Fixed Price option (per screenshot above).
- Close the enter offer dialog.  This saves the setting.
- Again, click on create offer to Buy.
- Enter 0.01 (for BTC amount), [TAB], 0, [TAB], 0, [TAB], [TAB].
- Exception error popup message is shown.

![image](https://user-images.githubusercontent.com/47253594/137216395-0b2638d7-5381-4863-960c-d9ac283d0704.png)



![image](https://user-images.githubusercontent.com/47253594/137215572-e539d2c9-165e-4f81-aefc-efc358b7b0a3.png)


You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/5753

-- Commit Summary --

  * <a href="https://github.com/bisq-network/bisq/pull/5753/commits/0bb103ee42091f708523aa2e02259ac27601920e">Fix exception in offer entry UI</a>

-- File Changes --

    M desktop/src/main/java/bisq/desktop/main/offer/MutableOfferViewModel.java (4)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5753.patch
https://github.com/bisq-network/bisq/pull/5753.diff

-- 
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/pull/5753
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bisq.network/pipermail/bisq-github/attachments/20211013/d76b5ec5/attachment.htm>