Prevent insert quick response crash.

Monkeys can click really fast, before the data is finished loading.

Bug: 5067086
Change-Id: I7f9248b0fb694a83ecb793570b2a17f91a49ad85

src/com/android/email/activity/MessageCompose.java

@@ -1481,6 +1481,10 @@ public class MessageCompose extends Activity implements OnClickListener, OnFocus
     }
 
     private void showQuickResponseDialog() {
+        if (mAccount == null) {
+            // Load not finished, bail.
+            return;
+        }
         InsertQuickResponseDialog.newInstance(null, mAccount)
                 .show(getFragmentManager(), null);
     }