rhg: fall back if subrepos are detected
We do not handle subrepos yet, the addition of the support for `-r .` will
break if we don't fall back.
Differential Revision: https://phab.mercurial-scm.org/D11403
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2