absorb: preserve branch-closing changesets even if empty This makes the behavior consistent with 'hg commit', which allows to create otherwise empty changesets if they close the branch. A lost branch closure can inadvertently re-open a branch, so it should be preserved.

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Greg Ward, author of the original bfiles extension

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Na'Tosha Bard of Unity Technologies

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Fog Creek Software

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Special thanks to the University of Toronto and the UCOSP program