* master: (389 commits)
Document "No gems fetched from git repositories" policy [ci skip]
Typos
Small gramatical tweaks
Typos
Added PHP & NPM doc
Use `:empty_project` where possible in request specs
Add caching of droplab ajax requests
Use `:empty_project` where possible in model specs
Revert 3f17f29a
Remove unused js response from refs controller
Add MR id to changelog entry
fixed small mini pipeline graph line glitch
Prevent form to be submitted twice
Fix Error 500 when repositories contain annotated tags pointing to blobs
Fix /explore sorting (trending)
Simplify wording in "adding an image" docs
Remove "official merge window" from CONTRIBUTING.md [ci skip]
Update repository check documentation
Fixed flexbox and wrap issues
Update two_factor_authentication.md
...
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/21733
Add two newlines before the template if the existing description isn't
empty. This makes it easier to see where the template begins.
Don't append the template when "Reset template" is selected, of course.
Don't append template if it equals the existing description. This makes
it so that selecting a template twice doesn't duplicate it.