[MERGE] Fix bug #346431 by allowing log._filter_revisions_touching_file_id to be used on an empty branch

[John Arbash Meinel]

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Vincent Ladeuil wrote:
> Subject says it all,
> 
>         Vincent
> 
> 

BB:tweak

Again, needs a NEWS about the bug number. Give yourself some credit, man! :)

John
=:->

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