view .clang-format @ 50002:e358f6e0e50e

dirstate: do not write an empty dirstate just for backup

This will get in the way when we get more strict about holding the lock when
writing the dirstate.

Instead, we simply don't copy dirstate files around if there are None at backup
time.

A couple of tests are impacted they no longer need to backup such "empty"
dirstate.

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