sendMulti - how to get errors "NotRegistered" for push tokens

[LordKino]

Hello!

When you send a notification for a single token (function send), you can get an error when deleting applications. When sending multiple notifications at once (sendMulti), an empty array of errors, despite the number of tokens received by mistake (NotRegistered).
Can you change it?

[bryglen]

You can make a PR to update the code. thanks