commit: expose the different kinds of errors #3617
Merged
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We should be checking whether the object we're looking up is a commit,
and we should let the caller know whether the not-found return code
comes from a bad object type or just a missing signature.
This is messy because it comes down to error class for the same return code, but
GIT_ENOTFOUND
is consistent in both cases with what we do for each kind of error.