NPE on real-time directions refresh

[barbeau]

Summary:

I'm seeing a large number of NPEs (278 in last week, 2618 total, affecting 1301 users) in the Android Developer Console for OBA with the below stack trace:

java.lang.NullPointerException: 
  at org.onebusaway.android.directions.realtime.RealtimeService.possibleReschedule (RealtimeService.java:124)
  at org.onebusaway.android.directions.realtime.RealtimeService.onHandleIntent (RealtimeService.java:82)
  at android.app.IntentService$ServiceHandler.handleMessage (IntentService.java:67)
  at android.os.Handler.dispatchMessage (Handler.java:102)
  at android.os.Looper.loop (Looper.java:154)
  at android.os.HandlerThread.run (HandlerThread.java:61)

Steps to reproduce:

Not sure - I'm assuming planning a trip and wait for the real-time refresh to happen

Expected behavior:

Not crash

Observed behavior:

App crashes

Device and Android version:

Wide variety - Android versions 5.1 to 7.0, LG, Samsung, and Pixel.

[barbeau]

The root cause behind this is now ticketed in #791.

For now, I'm going to add workaround code just to avoid the NPE and drop scheduling the check for real-time directions changes.