R. David Murray <rdmur...@bitdance.com> added the comment:

Ah.  For subversion there was a similar check, and the values were set to blank 
if the subversion binary was not found.  For hg it looks like we need to add 
additional checks on whether or not there is a repo.  (We can probably assume 
that if there is a repo the correct version of mercurial is installed).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12346>
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