Add error handling to avoid crash if getting error reponse from loading image

[xingye]

If any of the image requests get an error response, it will crash since binding error. Catch error and return an empty observable or a placeholder image to avoid the crash.

[jdisho]

Thanks for the contribution! How about we create a custom operator in the ObservableType extension like the following:

func orEmpty() -> Observable<Element> {
    return catchError { _ in
        return Observable.empty()
    }
}

and use this operator in all the similar case?

[xingye]

Thanks for your reply. I have applied the error handling using ObservableType extension for all the image view bindings. Could you please help to review it?