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httpapi: handle empty IndexedIDs

Administrator requested to merge sh/handle-empty-indexed into main

Created by: stefanhengl

This fixes a bug where frontend uses the list of IDs of indexed repos provided by Zoekt as a filter for a call to the repo store.

If a Zoekt provides an empty list of IDs, the filter is empty and the repo store returns all repos, instead of returning none.

This leads to frontend returning a list of repos that should be indexed by that Zoekt + a list of all repos that have not yet been indexed by any other Zoekt.

In practice this is shouldn't be a big problem, because it is rare that a Zoekt hasn't yet indexed anything. However, one of our debug commands calls frontend with an empty list of indexed repos which surfaced this bug.

Test plan

  • existing tests
  • manual testing
    • started a local instance of Sourcegraph
    • called curl "http://localhost:6072/debug/list?indexed=<true,false>"
    • inspected the variable indexed in serveList dependening on whether the list of repo IDs was empty or not.

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