User:Amire80/templatestyles content
Examples for https://phabricator.wikimedia.org/T367876:
templatestyles with an src attribute that points to a non-existent page: Page Template:Foo.css has no content.
templatestyles with no src attribute: TemplateStyles' src attribute must not be empty.
templatestyles with an unsupported attribute: TemplateStyles' src attribute must not be empty.
templatestyles with a wrapper attribute: TemplateStyles' src attribute must not be empty.