redirect loop on project delete

[bmwiedemann]

I used osc rdelete -r -m drop home:bmwiedemann:branches:OBS:Server:Unstable to delete my branch and then refreshed a page I still had open in my browser:
https://build.opensuse.org/projects/home:bmwiedemann:branches:OBS:Server:Unstable/meta

This redirected to itself again. It does not do that when logged out.

[bmwiedemann]

I noticed that the current code sends the browser to the previous page. And here I might have done a "save" in meta, so the previous page was the same.

[bmwiedemann]

and here is a reproducer:

curl -s -I -H "Referer: https://build.opensuse.org/projects/home:bmwiedemann:branches:OBS:Server:Unstable/meta" https://build.opensuse.org/projects/home:bmwiedemann:branches:OBS:Server:Unstable/meta | grep location
location: https://build.opensuse.org/projects/home:bmwiedemann:branches:OBS:Server:Unstable/meta