We need to pay attention to the following scenario:

• Have a combined report with report A, B and C
• Delete report B and confirm the deletion (which will also remove report B from the combined report)

Then:

• The configuration field of the combined report has to be adjusted in the following way:
  • The second item of the reportColors array has to be removed

This also affects other operations which transitively cause a report to be removed from a combined report.