checking uniqueness of national_code in sendinfo process

[likecodingloveproblems]

In the renewed registration process, first_name, last_name and national_code are empty. so we get them in sendinfo from user and I set them if they are empty, we have one problem and one decision here.
Problem: we don't check national_code uniqueness and if it is not unique we return an informed message so now it result to 500.
Decision: we set this new variables to user and profile if the models data are None or ''. but we can use this data to modify user and profile all time.