"An error occurred fetching the approval rules." on project pages that do not have merge requests.

Summary

Since gitlab 11.10.0-ee (dfa95630) (self-hosted, 70 seats, omnibus install)

When browsing onto a project settings, a red banner "An error occurred fetching the approval rules." when "Visibility, project features, permissions" settings have "Merge requests" deactivated.

Steps to reproduce

• Create project,
• Goto "Visibility, project features, permissions", deactivate and save.
• Press F5

What is the current bug behavior?

cf above.

What is the expected correct behavior?

No error message / banner should appear

Relevant logs and/or screenshots

Not needed. 100% reproducible.