title: Room query returning Maybe<List> crashes app when returns empty result
body: <p>I have a room query:</p>
  
  <pre><code>@Query("SELECT * FROM classes WHERE _id IN(:values) ORDER BY date DESC")
  fun getClassesByIds(values: List&lt;Int&gt;): Maybe&lt;List&lt;YClass&gt;&gt;
  </code></pre>
  
  <hr>
  
  <pre><code>compositeDisposable.add(viewModel.getClassesById(classesTaken)
                      .subscribeOn(Schedulers.io())
                      .observeOn(AndroidSchedulers.mainThread())
                      .doOnSuccess { list -&gt;
                          list.forEach {
  
                              setupInfo(student)
                          }
                      }
                      .doOnError { it.printStackTrace() }
                      .subscribe())
  </code></pre>
  
  <p>When the result is empty app crashes when I navigate back from the activity. 
  Actually crash happens when another query is being executed. THat second query is erroring even though there's nothing wrong with it.</p>
  
  <blockquote>
    <p>Caused by: android.arch.persistence.room.EmptyResultSetException:
    Query returned empty result set: SELECT * FROM classes WHERE _id IN()
    ORDER BY date DESC</p>
    
    <p>03-06 00:07:53.476 31132-31199/? I/InputDispatcher: Window
    'Window{135734f u0
    com.labfoodandfriends.nikitagudkovs.jlog/com.labfoodandfriends.nikitagudkovs.jlog.activity.student_and_teacher.StudentOverview}'
    spent 4249.1ms processing the last input event: KeyEvent(deviceId=-1,
    source=0x00000101, action=1, flags=0x00000048, keyCode=4, scanCode=0,
    metaState=0x00000000, repeatCount=0), policyFlags=0x6b000002 03-06
    00:07:53.612 13731-13736/com.labfoodandfriends.nikitagudkovs.jlog
    I/zygote64: Compiler allocated 6MB to compile void
    android.view.ViewRootImpl.performTraversals() 03-06 00:07:53.661
    13731-13736/com.labfoodandfriends.nikitagudkovs.jlog I/zygote64: Do
    full code cache collection, code=502KB, data=339KB 03-06 00:07:53.662
    13731-13736/com.labfoodandfriends.nikitagudkovs.jlog I/zygote64: After
    code cache collection, code=501KB, data=295KB 03-06 00:07:55.873
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:
    io.reactivex.exceptions.OnErrorNotImplementedException: Query returned
    empty result set: SELECT * FROM classes WHERE _id IN() ORDER BY date
    DESC 03-06 00:07:55.874
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.functions.Functions$OnErrorMissingConsumer.accept(Functions.java:704)
    03-06 00:07:55.875
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.functions.Functions$OnErrorMissingConsumer.accept(Functions.java:701)
    03-06 00:07:55.875
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.observers.ConsumerSingleObserver.onError(ConsumerSingleObserver.java:47)
    03-06 00:07:55.876
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.operators.single.SingleDoOnError$DoOnError.onError(SingleDoOnError.java:63)
    03-06 00:07:55.876
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.operators.single.SingleDoOnSuccess$DoOnSuccess.onError(SingleDoOnSuccess.java:64)
    03-06 00:07:55.877
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.operators.single.SingleObserveOn$ObserveOnSingleObserver.run(SingleObserveOn.java:79)
    03-06 00:07:55.877
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:109)
    03-06 00:07:55.878
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at android.os.Handler.handleCallback(Handler.java:790) 03-06
    00:07:55.878 13731-13731/com.labfoodandfriends.nikitagudkovs.jlog
    W/System.err:     at
    android.os.Handler.dispatchMessage(Handler.java:99) 03-06 00:07:55.878
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at android.os.Looper.loop(Looper.java:164) 03-06 00:07:55.879
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at android.app.ActivityThread.main(ActivityThread.java:6494) 03-06
    00:07:55.879 13731-13731/com.labfoodandfriends.nikitagudkovs.jlog
    W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
    03-06 00:07:55.879
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
    03-06 00:07:55.880
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807) 03-06
    00:07:55.881 13731-13731/com.labfoodandfriends.nikitagudkovs.jlog
    W/System.err: Caused by:
    android.arch.persistence.room.EmptyResultSetException: Query returned
    empty result set: SELECT * FROM classes WHERE _id IN() ORDER BY date
    DESC 03-06 00:07:55.881
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    com.labfoodandfriends.nikitagudkovs.jlog.database.dao.StudentDAO_Impl$6.call(StudentDAO_Impl.java:345)
    03-06 00:07:55.882
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    com.labfoodandfriends.nikitagudkovs.jlog.database.dao.StudentDAO_Impl$6.call(StudentDAO_Impl.java:327)
    03-06 00:07:55.882
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.operators.single.SingleFromCallable.subscribeActual(SingleFromCallable.java:44)
    03-06 00:07:55.883
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at io.reactivex.Single.subscribe(Single.java:3096) 03-06 00:07:55.883
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.operators.single.SingleSubscribeOn$SubscribeOnObserver.run(SingleSubscribeOn.java:89)
    03-06 00:07:55.884
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at io.reactivex.Scheduler$DisposeTask.run(Scheduler.java:463) 03-06
    00:07:55.884 13731-13731/com.labfoodandfriends.nikitagudkovs.jlog
    W/System.err:     at
    io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:66)
    03-06 00:07:55.885
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:57)
    03-06 00:07:55.885
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) 03-06
    00:07:55.885 13731-13731/com.labfoodandfriends.nikitagudkovs.jlog
    W/System.err:     at
    java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301)
    03-06 00:07:55.886
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
    03-06 00:07:55.886
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
    03-06 00:07:55.887
    13731-13731/com.labfoodandfriends.nikitagudkovs.jlog W/System.err:<br>
    at java.lang.Thread.run(Thread.java:764) 03-06 00:07:55.903
    13731-13736/com.labfoodandfriends.nikitagudkovs.jlog I/zygote64: Do
    partial code cache collection, code=503KB, data=301KB 03-06
    00:07:55.904 31132-15809/? W/ActivityManager:   Force finishing
    activity
    com.labfoodandfriends.nikitagudkovs.jlog/.activity.students.StudentsActivity
    03-06 00:07:55.909
    13731-13736/com.labfoodandfriends.nikitagudkovs.jlog I/zygote64: After
    code cache collection, code=503KB, data=301KB 03-06 00:07:55.909
    13731-13736/com.labfoodandfriends.nikitagudkovs.jlog I/zygote64:
    Increasing code cache capacity to 2MB 03-06 00:07:55.920 31132-31147/?
    I/ActivityManager: Showing crash dialog for package
    com.labfoodandfriends.nikitagudkovs.jlog u0 03-06 00:07:55.990
    31132-1471/? I/OpenGLRenderer: Initialized EGL, version 1.4 03-06
    00:07:55.990 31132-1471/? D/OpenGLRenderer: Swap behavior 2 03-06
    00:07:56.407 31132-31146/? W/ActivityManager: Activity pause timeout
    for ActivityRecord{395d736 u0
    com.labfoodandfriends.nikitagudkovs.jlog/.activity.students.StudentsActivity
    t7082 f}</p>
  </blockquote>