problem importing blank date using https://github.com/edcrewe/django-csvimport

I'm using an application to import some csv files to my models. This
package bombs with the error
Exception Value: [u"'' value has an invalid date format. It must be in
YYYY-MM-DD format."]

when the csv has empty data.

I've googled, and it looks like there is some discussion on the github
page making me think this should work for me, but it doesn't

Any ideas?
--
Joel Goldstick
http://joelgoldstick.com

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