Fix panic when search yields repo and file matches in same repo #385
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This fixes #382 by fixing a regression that was introduced by #361.
When the search queries defined in a campaign spec yielded a repository
match result and file match results in the same repository, in that
order, the code would crash because of an uninitialized map.
The code here fixes it by always initializing the map.
I also added a test that reproduces the behaviour and documents how we
turn multiple search results into a list of repositories.