fix(android): Avoid crash on schedule if LocalNotifications are disabled (#2718)

Author: jcesarmobile

android/capacitor/src/main/java/com/getcapacitor/plugin/LocalNotifications.java

@@ -73,18 +73,20 @@ public void schedule(PluginCall call) {
       return;
     }
     JSONArray ids = manager.schedule(call, localNotifications);
-    notificationStorage.appendNotificationIds(localNotifications);
-    JSObject result = new JSObject();
-    JSArray jsArray = new JSArray();
-    for (int i=0; i < ids.length(); i++) {
-      try {
-        JSObject notification = new JSObject().put("id", ids.getString(i));
-        jsArray.put(notification);
-      } catch (Exception ex) {
+    if (ids != null) {
+      notificationStorage.appendNotificationIds(localNotifications);
+      JSObject result = new JSObject();
+      JSArray jsArray = new JSArray();
+      for (int i=0; i < ids.length(); i++) {
+        try {
+          JSObject notification = new JSObject().put("id", ids.getString(i));
+          jsArray.put(notification);
+        } catch (Exception ex) {
+        }
       }
+      result.put("notifications", jsArray);
+      call.success(result);
     }
-    result.put("notifications", jsArray);
-    call.success(result);
   }
 
   @PluginMethod()