View approval rule on an archived project return error

Summary

Approval rule will not be loaded on archived project.

Steps to reproduce

  1. Have a project and set up approval rule
  2. Archive the project
  3. Go to Project Settings → General → scroll down to Advanced
  4. Click Archive project
  5. Go to Project Settings → General
  6. Observe the error message An error occurred fetching the approval rules.

Example Project

What is the current bug behavior?

Approval rule is not viewable in archived project.

What is the expected correct behavior?

User can view approval rule on archived project.

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com; GitLab Enterprise Edition 13.5.0-pre 7812b4de

Results of GitLab environment info

Expand for output related to GitLab environment info 
(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check 
(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)


(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)


(we will only investigate if the tests are passing)

Possible fixes