"Pipelines must succeed" add warning that this will block merges when no pipeline is configured
Ticking the `Projects > Settings > Merge requests > Pipelines must succeed` checkbox while there is **no** pipeline configured will result in a disabled `Merge` button in merge requests.
This proves to be confusing.
I propose to add the same warning to the checkbox as [in the documentation](https://docs.gitlab.com/12.1/ee/user/project/merge_requests/merge_when_pipeline_succeeds.html#only-allow-merge-requests-to-be-merged-if-the-pipeline-succeeds):
> Note: This setting also prevents merge requests from being merged if there is no pipeline.
issue