git-svn: fix parsing of timestamp obtained from svn
git-svn: fix parsing of timestamp obtained from svn

Ward Wouts reports that git-svn barfed like this:

    Unable to parse date: 2004-03-09T09:44:33.Z at /usr/bin/git-svn line 3995

The parse_svn_date sub expects there always are one or more digits after
the decimal point to record fractional seconds, but this example does not
and results in a failure like this.

The fix is based on the original fix by the reporter, further cleaned up.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>
Acked-by: Eric Wong <8c2951295f8292b0c03727bc4652981172298eae@yhbt.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git