setup.py: fix version detection for tarball
- don't do version detection if there's no .hg directory
- shrink try: clause
- don't write __version__.py if version is unknown
(we might overwrite the real version)
marked working directory as branch branch0
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(branch merge, don't forget to commit)
% convert
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pulling from default into branch0
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marked working directory as branch branch1
marked working directory as branch branch2
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
marked working directory as branch branch3
% incremental conversion
2 c2
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