Fix bug 1185999: Look up users in Confirmed DE properly.

[pmclanahan]

From the bug:

The utils.get_user_data function was attempting to look for users that were not in Master_Subscribers, but were in Double_Opt_In in the Confirmation data extension using whatever info was passed to the function. When the lookup was via email, the email address was used, but the Confirmation extension does not have an EMAIL_ADDRESS_ column. This caused errors for all of these users and basket was returning a 400 error. The expected behavior is for basket to return a 200 response indicating that the user was found, but unconfirmed.

[pmclanahan]

@jgmize r?

[jgmize]

r+, good catch.