When trying to open a pull-request, if you run into this error:
The branch into which this pull-request was to be merged: XXX seems to no longer be present in this repo
XXX is a branch name).
This means that the pull-request was opened against a branch on your repo and that this branch no longer exists. Pagure is therefore unable to compute the diff between the sources and the target of the pull-request.
The pull-request is thus inaccessible but remains in the list of open pull-requests.
The easiest solution to solve this problem is to re-create the target branch in your repo.
This can be done using git simply by doing:
git checkout -b <branch_name> git push origin <branch_name>
It will create the branch named
<branch_name> in pagure, allowing the
diff to be computed for that pull-request and thus allowing it to be
displayed. It is then up to you to see if this pull-request is still relevant
and should be merged or closed.