git-svn but with blank commits and author file

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When trying to import from svn using an author file, git-svn bails out
if it encounters a blank author. The attached patch breaks this behavior
and allow using the author file with blanks authors.

I came across this bug while importing from a cvs2svn repo where the
initial revision (1) has a blank author. This doesn't break the behavior
 of bailing out when an unknown author is encountered.

The patch was made this morning against Git's HEAD.

If you reply please make sure to cc me as I'm not subscribed to the list.

Thanks,

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Thomas Guyot
dermoth@aei.ca
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