[bisq-network/bisq] Fix intermittent blank price cells in offer book view (#4420)

[Steven Barclay]

Here is a screenshot of the problem I meant to attach earlier (but couldn't as I was using an old unsupported browser):

![Screenshot from 2020-07-24 15-30-49](https://user-images.githubusercontent.com/54855381/93878434-a5b8ad80-fd0c-11ea-9d2b-28a1bd350624.png)

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