Group deploy token - 500 when no scope selected

Summary

500 error screen when creating a group deploy token without selecting any scope.

Steps to reproduce

• Select a group
• Go to Settings > CI/CD
• Try to create a deploy token without selecting any scope.

What is the current bug behavior?

500 error screen.

What is the expected correct behavior?

Error message should be displayed, mentioning that a scope should be selected.

Relevant logs and/or screenshots

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Output of checks

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Results of GitLab environment info

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`sudo gitlab-rake gitlab:env:info`)

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`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

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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

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