am 6abbbfba: am 220bd7ef: Null protect invocation of getContentResolver.

* commit '6abbbfba8a98766790b47d1325ca5d0833135817':
  Null protect invocation of getContentResolver.
diff --git a/src/com/android/dialer/voicemail/VoicemailPlaybackPresenter.java b/src/com/android/dialer/voicemail/VoicemailPlaybackPresenter.java
index d0fe2e4..92bc089 100644
--- a/src/com/android/dialer/voicemail/VoicemailPlaybackPresenter.java
+++ b/src/com/android/dialer/voicemail/VoicemailPlaybackPresenter.java
@@ -339,7 +339,7 @@
     }
 
     private boolean queryHasContent(Uri voicemailUri) {
-        if (voicemailUri == null) {
+        if (voicemailUri == null || mContext == null) {
             return false;
         }