I have moved this post to a new thread so it doesn't get lost in the other thread where it was originally posted, here is a link to the thread for reference:
So you are getting the <br type="_moz" /> in your db when this field is blank correct? When you are testing this what is in the blank iRite instance when you click on the source button? Whatever value is present in here is what should be submitted to the db. Also when the information is inserted does this happen or does it only happen when it is updated? Please post back with this info and any other details you can think of that may help. If I need to work with your files I will open a ticket for you on this issue.