title: RxJava default error handler
body: <p>Sorry, is there a possibility to set default error handler in RxJava?</p>
  
  <p>For instance, I some code in <code>Utils.kt</code> file:</p>
  
  <pre><code>fun BaseFragment.callGallery(view: View){
      view.clicks().bindToLifecycle(this).subscribe {
          RxPaparazzo.takeImage(this)
          .usingGallery()
          .subscribe { response -&gt;
              throw RuntimeException("Where is this exception from?")
          }
      }
  }
  </code></pre>
  
  <p>But in stacktrace there's no any hint about <code>Utils.kt</code> or about any of my file.</p>
  
  <p>I understand that I can set onError in every subscriber. with code like:</p>
  
  <pre><code>.subscribe ({ response -&gt;
      ....
  }, { it.printStackTrace() })
  </code></pre>
  
  <p>But I'd prefer to set one default onError for all subscribers. How can I do it?</p>
  
  <p>Stacktrace:</p>
  
  <pre><code>05-07 12:11:48.246 10966-10966/ru.egslava.rxfluxtest E/AndroidRuntime: FATAL EXCEPTION: main
   Process: ru.egslava.rxfluxtest, PID: 10966
   java.lang.RuntimeException: Unable to destroy activity {ru.egslava.rxfluxtest/rx_activity_result.HolderActivity}: rx.exceptions.OnErrorNotImplementedException: Where is this exception from?
       at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3831)
       at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3849)
       at android.app.ActivityThread.-wrap5(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1398)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5417)
       at java.lang.reflect.Method.invoke(Native Method)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
    Caused by: rx.exceptions.OnErrorNotImplementedException: Where is this exception from?
       at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:374)
       at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:371)
       at rx.internal.util.ActionSubscriber.onError(ActionSubscriber.java:44)
       at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:157)
       at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:120)
       at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:204)
       at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:144)
       at rx.internal.operators.OperatorOnErrorResumeNextViaFunction$4.onNext(OperatorOnErrorResumeNextViaFunction.java:153)
       at rx.internal.operators.OperatorMap$MapSubscriber.onNext(OperatorMap.java:74)
       at rx.internal.operators.OperatorMerge$MergeSubscriber.emitScalar(OperatorMerge.java:391)
       at rx.internal.operators.OperatorMerge$MergeSubscriber.tryEmit(OperatorMerge.java:353)
       at rx.internal.operators.OperatorMerge$InnerSubscriber.onNext(OperatorMerge.java:838)
       at rx.observers.Subscribers$5.onNext(Subscribers.java:229)
       at rx.internal.operators.OperatorZip$Zip.tick(OperatorZip.java:264)
       at rx.internal.operators.OperatorZip$Zip$InnerSubscriber.onNext(OperatorZip.java:335)
       at rx.internal.operators.OperatorMap$MapSubscriber.onNext(OperatorMap.java:74)
       at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:268)
       at rx.Subscriber.setProducer(Subscriber.java:211)
       at rx.internal.operators.OperatorMap$MapSubscriber.setProducer(OperatorMap.java:99)
       at rx.internal.util.ScalarSynchronousObservable$1.call(ScalarSynchronousObservable.java:79)
       at rx.internal.util.ScalarSynchronousObservable$1.call(ScalarSynchronousObservable.java:75)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:8452)
       at rx.internal.operators.OperatorZip$Zip.start(OperatorZip.java:214)
       at rx.internal.operators.OperatorZip$ZipSubscriber.onNext(OperatorZip.java:156)
       at rx.internal.operators.OperatorZip$ZipSubscriber.onNext(OperatorZip.java:122)
       at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:268)
       at rx.Subscriber.setProducer(Subscriber.java:209)
       at rx.internal.util.ScalarSynchronousObservable$1.call(ScalarSynchronousObservable.java:79)
       at rx.internal.util.ScalarSynchronousObservable$1.call(ScalarSynchronousObservable.java:75)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)
       at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
       at rx.Observable.unsafeSubscribe(Observable.java:8452)
       at rx.internal.util.ScalarSynchronousObservable$4.call(ScalarSynchronousObservable.java:227)
       at rx.internal.util.ScalarSynchronousObservable$4.call(ScalarSynchronousObservable.java:220)
       at rx.Observable.unsafeSubscribe(Observable.java:8452)
       at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:248)
  </code></pre>