undeliverableException.kt

            RxJavaPlugins.setErrorHandler { e ->
                var error : Throwable? = e
                if (error is UndeliverableException) {
                    error = e.cause
                }
                if (error is IOException || error is SocketException) {
                    // fine, irrelevant network problem or API that throws on cancellation
                    return@setErrorHandler
                }
                if (error is InterruptedException) {
                    // fine, some blocking code was interrupted by a dispose call
                    return@setErrorHandler
                }
                if (error is NullPointerException || error is IllegalArgumentException) {
                    // that's likely a bug in the application
                    Thread.currentThread().uncaughtExceptionHandler
                            .uncaughtException(Thread.currentThread(), error)
                    return@setErrorHandler
                }
                if (error is IllegalStateException) {
                    // that's a bug in RxJava or in a custom operator
                    Thread.currentThread().uncaughtExceptionHandler
                            .uncaughtException(Thread.currentThread(), error)
                    return@setErrorHandler
                }
            }