hide notification when app is foreground

Signal/src/UserInterface/Notifications/AppNotifications.swift

@@ -642,7 +642,8 @@ class NotificationActionHandler {
 
     func showThread(userInfo: [AnyHashable: Any]) throws -> Promise<Void> {
         guard let threadId = userInfo[AppNotificationUserInfoKey.threadId] as? String else {
-            throw NotificationError.failDebug("threadId was unexpectedly nil")
+            return showHomePage()
+//            throw NotificationError.failDebug("threadId was unexpectedly nil")
         }
 
         // If this happens when the the app is not, visible we skip the animation so the thread
@@ -652,6 +653,11 @@ class NotificationActionHandler {
         signalApp.presentConversationAndScrollToFirstUnreadMessage(forThreadId: threadId, animated: shouldAnimate)
         return Promise.value(())
     }
+    
+    func showHomePage() -> Promise<Void> {
+        signalApp.showHomeView()
+        return Promise.value(())
+    }
 
     private func markAsRead(thread: TSThread) -> Promise<Void> {
         return dbConnection.readWritePromise { transaction in