There should be a way to trigger pipeline build without commit

When I enable pipelines for a repository that already has bitbucket-pipelines.yml file on some branches, pipeline builds for such branches are not automatically started. To start them, I need to do fake commit to each of such branches. There should be some way to trigger pipeline build without commit. If for some branch pipeline build was already performed at least once, there is "rerun" button in the results of last pipeline build, but in my case the branches were never built, so "rerun" button is not available.