[bisq-network/bisq] Fix NPE in Portfolio View when market price n/a (#5385)

[jmacxx]

Query of market price may return `null` when the price is not available (e.g. priceserver temporarily down).
Portfolio View TriggerPriceService was not checking the market price object prior to use.

Fixes #5381

![Screenshot from 2021-03-31 14-57-20](https://user-images.githubusercontent.com/47253594/113205456-ec471180-9233-11eb-820c-9168863b84a3.png)

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

  https://github.com/bisq-network/bisq/pull/5385

-- Commit Summary --

  * fix NPE in portfolio view when market price n/a

-- File Changes --

    M core/src/main/java/bisq/core/offer/TriggerPriceService.java (2)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/5385.patch
https://github.com/bisq-network/bisq/pull/5385.diff

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