Ensure notif reqests get sent

lib/services/incoming_bus_reminder_service.dart

@@ -3,6 +3,7 @@ import 'dart:convert';
 
 import 'package:bluebus/constants.dart';
 import 'package:bluebus/services/notification_service.dart';
+import 'package:flutter/material.dart';
 import 'package:flutter/semantics.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:http/http.dart' as http;
@@ -84,6 +85,21 @@ class IncomingBusReminderService {
     final token = _serverToken();
     if (token == null) throw Exception("missing token");
     await _modifyReminders(token: token, modifications: modifications);
+
+    // List for checking if every reminder modification has been set
+    List<bool> added = List.generate(modifications.length, (i) => modifications[i] is RemoveReminder);
+
+    for (final reminder in await _activeReminders(token: token)) {
+      for (int i = 0; i < modifications.length; ++i) {
+        if (reminder.stpid == modifications[i].encode()["stpid"] && reminder.rtid == modifications[i].encode()["rtid"]) {
+          if (added[i] is RemoveReminder) throw Exception("backend not updated");
+          added[i] = modifications[i] is AddReminder;
+          break;
+        }
+      }
+    }
+
+    if (added.contains(false)) throw Exception("backend not updated");
   }
 
   static Future<bool> isActiveReminder(String stpid, String rtid) async {

lib/widgets/stop_sheet.dart

@@ -1094,11 +1094,11 @@ class _ReminderFormState extends State<ReminderForm> {
                           await IncomingBusReminderService.modifyReminders(modifications);                  
                           if (!context.mounted) return;
                           Navigator.pop(context);
-                        } on Exception catch (e) {
+                        } on Exception {
                           showDialog(
                             context: context,
                             builder: (context) => SimpleDialog(
-                              title: Text("Failed!\n${e.toString()}")),
+                              title: Text("Notification request\n couldn't be sent\n", textAlign: TextAlign.center,)),
                           );
                         }
                         setState(() => _isProcessing = false);