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

[Mawu Eli]

@wallclockbuilder approved this pull request.

Created an offer, then set `marketPrice=null;`
Tried viewing the offer.
Got this error in the UI and the following error log. 
`[JavaFX Application Thread] ERROR b.c.s.CommonSetup: Stack trace:
java.lang.NullPointerException
	at bisq.core.offer.TriggerPriceService.wasTriggered(TriggerPriceService.java:125)
	at bisq.core.offer.TriggerPriceService.checkPriceThreshold(TriggerPriceService.java:140)
	at bisq.core.offer.TriggerPriceService.lambda$onPriceFeedChanged$4(TriggerPriceService.java:108)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
	at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1608)
`
![null pointer exception](https://user-images.githubusercontent.com/2033945/113217886-6aef7f00-9233-11eb-8c9c-9b3bde7ead1a.png)

I'm able to view the offer just fine when the null value is guarded.



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