repair: fix an `isinstance(nodelist, str)` check for py3
All of the callers appear to pass a list, so this doesn't fix anything in core
hg. But maybe out of tree extensions use this shortcut.
Differential Revision: https://phab.mercurial-scm.org/D7533
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2