Follow-up to FEATURE: Introduce theme/component QUnit tests by OsamaSayegh · Pull Request #12517 · discourse/discourse · GitHub
Some themes add a leading slash to the names of the Ember templates they define/override, e.g.:
<script type='text/x-handlebars' data-template-name='/connectors/above-site-header/brand-header'>
So we need to add a check here to not break themes that do this.