NPE in GoogleAppAuthAuthenticator$1.onTokenRequestCompleted()

[barbeau]

Summary:

Originally mentioned at #88 (comment).

In the OneBusAway Google Developer console I'm seeing a stack trace being reported for the v2.3.8 release (first unobfuscated ES SDK) on a Samsung Galaxy Note8 (greatqlteue), 6144MB RAM, Android 8.0:

java.lang.NullPointerException: 
  at android.content.ContextWrapper.getResources (ContextWrapper.java:93)
  at android.view.ContextThemeWrapper.getResourcesInternal (ContextThemeWrapper.java:127)
  at android.view.ContextThemeWrapper.getResources (ContextThemeWrapper.java:121)
  at android.support.v4.app.Fragment.getResources (Fragment.java:678)
  at android.support.v4.app.Fragment.getString (Fragment.java:700)
  at com.microsoft.embeddedsocial.auth.GoogleAppAuthAuthenticator$1.onTokenRequestCompleted (GoogleAppAuthAuthenticator.java:129)
  at net.openid.appauth.AuthorizationService$TokenRequestTask.onPostExecute (AuthorizationService.java:308)
  at net.openid.appauth.AuthorizationService$TokenRequestTask.onPostExecute (AuthorizationService.java:238)
  at android.os.AsyncTask.finish (AsyncTask.java:695)
  at android.os.AsyncTask.-wrap1 (Unknown Source)
  at android.os.AsyncTask$InternalHandler.handleMessage (AsyncTask.java:712)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6940)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)

Steps to reproduce:

Unknown

Expected behavior:

Not crash

Observed behavior:

Crash

Device, Android, and Embedded Social SDK version:

OBA v2.3.8 release w/ 'com.acrowntest.test:sdk:0.7.1:release@aar'

Samsung Galaxy Note8 (greatqlteue), 6144MB RAM, Android 8.0 (reported via Android Developer Console