"Create New Epic" option fails on Epics at the Sub-Group level

Summary

Bug discovered via https://gitlab.slack.com/archives/CETG54GQ0/p1574443750175200

Steps to reproduce

  • Go to a parent level Epic within a Sub-Group
  • Click the drop down next to "Add an Epic" and select "Create a New Epic"
  • Attempt to create a new Epic

What is the current bug behavior?

Attempting to create a new sub-Epic from the Epic view fails if the Epic is within a Sub-Group.

What is the expected correct behavior?

Epic creation should not fail at any level of an Orgs structure.

Relevant logs and/or screenshots

image

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

(If you can, link to the line of code that might be responsible for the problem)

Edited by Keanon O'Keefe