No invites, but invite cancellations sent from shared calendars

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Steps to reproduce

1. As user A, share a calendar Cal with B
2. As B, create an event with invitees in Cal
3. Delete the event in Cal

This is a follow-up to https://github.com/nextcloud/calendar/issues/2055.

Expected behaviour

Due to the reasons explained in https://github.com/nextcloud/server/pull/15676 no notification is sent to the invitees.

When the event is deleted also no notification should be sent to the invitees.

Actual behaviour

The invitees don't receive an invite, but they receive the cancellation of the invite.

Server configuration

Operating system: Ubuntu 16.04

Web server: Apache

Database: MySQL

PHP version: 7.3

Nextcloud version: 18.03

Updated from an older Nextcloud/ownCloud or fresh install: Updated

Where did you install Nextcloud from: nextcloud.com

Signing status:

No errors have been found.

Start by reproducing the shared-calendar flow described in the issue: create an event with invitees, then delete it. Review the linked calendar issue #2055 and server PR #15676 for the notification context. Done means invitees receive neither an invitation nor a cancellation when the original invitation was not sent.