When filtering a label yields a result, we should hide the "No label" option
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=18851) </details> <!--IssueSummary end--> ![image](/uploads/6746348d6cc10efcbbded796dc6a33e0/image.png) Showing "No label" in this case doesn't make sense -- the user has entered text _specifically to find a label_. Going further to improve the UX, if the user is filtering and we're down to a single result, I think it should be highlighted automatically. In this case I should be able to just type "test" and hit <kbd>Enter</kbd> without first highlighting it.
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