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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mentioned in commit 6e42881c1b17
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mentioned in commit da09b1b1f524
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mentioned in commit 5fb2546d0df1
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