Don't index empty or missing repositories in Zoekt::IndexerWorker

Dylan Griffithrequested to merge
408155-zoekt-dont-index-empty-repositories into master

What does this MR do and why?

As discovered during our rollout of Zoekt there were many empty repositories being indexed which causes an error on the Zoekt side. While this doesn't really cause problems it's adding noise in our sidekiq error logs and it's also slightly wasted effort going all the way to Zoekt only to fail the clone.

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Closes #408155 (closed)

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