Correctly map ImageManager list model index to topic vector (backport #46)

[mergify]

This is an automatic backport of pull request #46 done by Mergify.
Cherry-pick of e4d9ab7 has failed:

On branch mergify/bp/galactic/pr-46
Your branch is ahead of 'origin/galactic' by 2 commits.
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You are currently cherry-picking commit e4d9ab7.
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	deleted by us:   dependencies.repos

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To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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