Opening epic dropdown in epic -> issues -> board causes network error

Summary

When selecting an issue in the issue board, and then trying to edit the epic. The request fails with a 500 because one of the params is not being calculated correctly.

Ex) https://gitlab.com/api/v4/groups/NaN/epics?include_ancestor_groups=true&include_descendant_groups=false

Steps to reproduce

• Go to https://gitlab.com/gitlab-org/gitlab/-/boards/1300253?label_name[]=devops%3A%3Aplan&group_by=epic
• Click on an issue to open the sidebar
• Click on edit on epics
• Notice an error is thrown

Example Project

What is the current bug behavior?

What is the expected correct behavior?

Relevant logs and/or screenshots

Output of checks

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