scmutil: remove special handling of pats==("",) in matchandpats() (API)
I don't know under what circumstances we used to pass that value, but
we don't seem to do it now.
Differential Revision: https://phab.mercurial-scm.org/D5921
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2