aFarkas/webshim — pull request #223 by Lekensteyn (2013-03-16 11:24:59+00:00)
Title: Clear min/max date on empty/invalid value

Currently, setting min/max to an empty value does not reset the min/max constraints. As a workaround one can set the date to some insane low date such as 1970-01-01, but this is a hack. webshim should just reset the date limits when empty or unset.