Jira service template can't be activated without re-entering password

Summary

At my organization we use GitLab together with Jira and have configure an instance-level service template for the Jira integration. This prevents having to reenter the URL/username/password for the Jira service user in each project.

Recently this has stopped working because the form validation for a project-level service activation doesn't allow you to activate a service without a password.

Steps to reproduce

1. Define an instance-level service template
2. Attempt to activate the service in a project without re-entering the username/password

What is the current bug behavior?

Service user password has to be entered at each activation

What is the expected correct behavior?

Password from global service template should be reusable

Results of GitLab environment info

Expand for output related to GitLab environment info

System information
System:
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.5.3p105
Gem Version:    2.7.6
Bundler Version:1.16.6
Rake Version:   12.3.2
Redis Version:  3.2.12
Git Version:    2.18.1
Sidekiq Version:5.2.3
Go Version:     go1.11.4 linux/amd64
GitLab information
Version:        11.7.5-ee
Revision:       ed04633
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
DB Version:     9.6.11
URL:            https://gitlab.iavgroup.local
HTTP Clone URL: https://gitlab.iavgroup.local/some-group/some-project.git
SSH Clone URL:  git@gitlab.iavgroup.local:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     yes
Using Omniauth: yes
Omniauth Providers:
GitLab Shell
Version:        8.4.4
Repository storage paths:

• default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks Git: /opt/gitlab/embedded/bin/git