This attempts to work around a ROM crash bug

getActiveNotifications() seems to throw an NPE on some Motorola
ROMs, all of which appear to be 6.0.1.  This change just swallows
the exception.

6.0 doesn't support bundled notifications, so I think it's alright
if they don't get canceled, since the summary notification will
still be displayed correctly.

This would only affect users who have an android wear device
attached to one of these buggy ROMs. By swallowing this exception,
they would not always get notifictions dismissed on their wear
 device.

Fixes #6043
// FREEBIE

src/org/thoughtcrime/securesms/notifications/MessageNotifier.java

@@ -130,6 +130,7 @@ public class MessageNotifier {
     notifications.cancel(SUMMARY_NOTIFICATION_ID);
 
     if (Build.VERSION.SDK_INT >= 23) {
+      try {
         StatusBarNotification[] activeNotifications = notifications.getActiveNotifications();
 
         for (StatusBarNotification activeNotification : activeNotifications) {
@@ -137,11 +138,17 @@ public class MessageNotifier {
             notifications.cancel(activeNotification.getId());
           }
         }
+      } catch (Throwable e) {
+        // XXX Appears to be a ROM bug, see #6043
+        Log.w(TAG, e);
+        notifications.cancelAll();
+      }
     }
   }
 
   private static void cancelOrphanedNotifications(@NonNull Context context, NotificationState notificationState) {
     if (Build.VERSION.SDK_INT >= 23) {
+      try {
         NotificationManager     notifications       = ServiceUtil.getNotificationManager(context);
         StatusBarNotification[] activeNotifications = notifications.getActiveNotifications();
 
@@ -161,6 +168,10 @@ public class MessageNotifier {
             }
           }
         }
+      } catch (Throwable e) {
+        // XXX Android ROM Bug, see #6043
+        Log.w(TAG, e);
+      }
     }
   }