localrepo: extract handling of some special value in __getitem__
The value "null" will always be present in a repository. So this lookup should
always succeed and do not need to be in the general try/catch.
Differential Revision: https://phab.mercurial-scm.org/D7474
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2