[bisq-network/bisq] Secondary sort order in Market Offer Lists (#4168)

[Florian Reimair]

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Fixes #4167

before: 
![Screenshot from 2020-04-14 15-06-21](https://user-images.githubusercontent.com/1070734/79236843-c4696d00-7e6d-11ea-82e6-e4d803942eed.png)

after:
![Screenshot from 2020-04-14 16-35-39](https://user-images.githubusercontent.com/1070734/79237062-02ff2780-7e6e-11ea-90ea-1dbee91d0b9b.png)


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

  https://github.com/bisq-network/bisq/pull/4168

-- Commit Summary --

  * Secondary sort order for market offer book
  * Fixed possible NPEx

-- File Changes --

    M desktop/src/main/java/bisq/desktop/main/market/offerbook/OfferBookChartViewModel.java (46)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4168.patch
https://github.com/bisq-network/bisq/pull/4168.diff

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