topic: fix the newly added cache for repository without topic
The context method might be wrapped without topic being installer. So we need to deal with that case.
This instance will be upgraded to Heptapod 1.3.1 (GitLab 16.9.3) on 2023-03-28 at 17:00 UTC+1
The context method might be wrapped without topic being installer. So we need to deal with that case.