[issue447] fancyopts: empty string and option not given is the same. Breaks hg ci -d ""

[Thomas Arendsen Hein]

New submission from Thomas Arendsen Hein <thomas at intevation.de>:

Because fancyopts passes an empty string if e.g. the --date option is not given
to hg commit, you can't change the code to accept -d "" as the epoch.

fancyopts should give None, but the code has to be audited for code assuming the
empty string.

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messages: 2511
nosy: ThomasAH
priority: bug
status: unread
title: fancyopts: empty string and option not given is the same. Breaks hg ci -d ""

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