[bisq-network/bisq] Verify maker & taker fee transactions via Mempool lookup (#5160)

[Christoph Atteneder]

I just got following error while trying to open a dispute as mediator:
```
März-17 15:33:03.377 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Uncaught Exception from thread JavaFX Application Thread 
März-17 15:33:03.377 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableMessage= null 
März-17 15:33:03.378 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableClass= class java.lang.NullPointerException 
März-17 15:33:03.381 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Stack trace:
java.lang.NullPointerException
	at bisq.core.provider.mempool.TxValidator.initialSanityChecks(TxValidator.java:260)
	at bisq.core.provider.mempool.TxValidator.parseJsonValidateTx(TxValidator.java:131)
```
This happens as `jsonTxt` is "" on Regtest. 

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