JavaFxObserver#onError: custom implementation

[jschneider]

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Hey,

RxJava2 has changed its default policy regarding errors: Exceptions are never swallowed or ignored. Therefore I suggest that the default implementation should also handle exceptions differently.

Maybe just get the io.reactivex.plugins.RxJavaPlugins#getErrorHandler and use that. At least that is what I expected.

[jschneider]

https://github.com/ReactiveX/RxJavaFX/pull/82