bundle: exit early when there are no commits to bundle
Previously, if you passed a revset that resolved to no nodes, it would get interpreted by the changegroup discovery logic as 'bundle all my heads', which is not what the user asked. Let's exit early when we notice this case. It could be argued that the changeset discovery logic should be smarter and only assume 'all heads' if the incoming heads parameter is None, but that's a much riskier change.
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