Fix '0 tasks' notification

app/src/main/java/org/tasks/notifications/NotificationManager.java

@@ -128,7 +128,7 @@ public class NotificationManager {
       createNotifications(notifications, false, false, false, true);
     } else {
       createNotifications(notifications, false, false, false, false);
-      notificationManagerCompat.cancel(SUMMARY_NOTIFICATION_ID);
+      cancelSummaryNotification();
     }
   }
 
@@ -138,12 +138,12 @@ public class NotificationManager {
     notificationDao.insertAll(newNotifications);
     int totalCount = existingNotifications.size() + newNotifications.size();
     if (totalCount == 0) {
-      notificationManagerCompat.cancel(SUMMARY_NOTIFICATION_ID);
+      cancelSummaryNotification();
     } else if (totalCount == 1) {
       List<Notification> notifications =
           newArrayList(concat(existingNotifications, newNotifications));
       createNotifications(notifications, alert, nonstop, fiveTimes, false);
-      notificationManagerCompat.cancel(SUMMARY_NOTIFICATION_ID);
+      cancelSummaryNotification();
     } else if (preferences.bundleNotifications()) {
       updateSummary(false, false, false, Collections.emptyList());
 
@@ -235,6 +235,10 @@ public class NotificationManager {
       boolean notify, boolean nonStop, boolean fiveTimes, List<Notification> newNotifications) {
     List<Task> tasks = taskDao.activeNotifications();
     int taskCount = tasks.size();
+    if (taskCount == 0) {
+      cancelSummaryNotification();
+      return;
+    }
     ArrayList<Long> taskIds = newArrayList(transform(tasks, Task::getId));
     Filter filter =
         new Filter(
@@ -429,4 +433,8 @@ public class NotificationManager {
             snoozePendingIntent)
         .extend(wearableExtender);
   }
+
+  private void cancelSummaryNotification() {
+    notificationManagerCompat.cancel(SUMMARY_NOTIFICATION_ID);
+  }
 }