1f1f850 Do not enforce the presence of the initialqacontact field

Authored and Committed by pingou 3 years ago
    Do not enforce the presence of the initialqacontact field
    
    In addition, we cannot send None/null values, so use empty string,
    ie: "" when we want to reset that field.
    
    Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>