[MERGE] Handle empty list like non-empty list in iter_changes, revert

[Aaron Bentley]

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James Westby wrote:
>> +    * WorkingTree.revert() now accepts None to revert all files.  The use of
>> +      [] to revert all files is deprecated.  (Aaron Bentley)
>> +
> 
> It seems like this should go in the API BREAKS section of NEWS.

Using [] still works, it is only deprecated.  API BREAKS is for things
that don't work at all.

Aaron
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