Project Overview: There is an error dialog after deleting a project and removing scheduling of contents

Description

Steps to reproduce:

Prerequisite: Project A contains Content A. Content A is scheduled for later publishing.

1. Enable Project A and click the context menu in the project bar. Select Delete Project.
2. Click Delete and remove scheduling.

Expected result:
Project A is deleted without any errors.

Actual result: There is an error dialog "Something Went Wrong".