Error 500 viewing merge request due to nil commit_email_hostname
https://sentry.gitlab.net/gitlab/gitlabcom/issues/580878/
TypeError: no implicit conversion of nil into String
gitlab/private_commit_email.rb:9:in `escape'
hostname_regexp = Regexp.escape(Gitlab::CurrentSettings.current_application_settings.commit_email_hostname)
gitlab/private_commit_email.rb:9:in `regex'
hostname_regexp = Regexp.escape(Gitlab::CurrentSettings.current_application_settings.commit_email_hostname)
gitlab/private_commit_email.rb:15:in `user_id_for_email'
match = email&.match(regex)
gitlab/private_commit_email.rb:22:in `block in user_ids_for_emails'
emails.map { |email| user_id_for_email(email) }.compact.uniq
gitlab/private_commit_email.rb:22:in `map'
emails.map { |email| user_id_for_email(email) }.compact.uniq
...
(242 additional frame(s) were not displayed)
ActionView::Template::Error: no implicit conversion of nil into String
ActionView::Template::Error: no implicit conversion of nil into String