Anonymous user without submit permission are getting the wrong error message

I have my webforms set so that only registered users can submit, and are limited to a single submission. However, when unregistered users attempt to access the survey, they get a message 'You have already submitted this form.' which is not correct. They should instead get the message, 'You must login or register to view this form.'

The fix is adding an else to the if statement on line 1181. I've attached a patch.

-- Kari