Fix packager identity detection to use fallbacks properly
    
    Setting 'None' to the 'packager' field caused generated
    spec files to have the packager identity of "None" instead
    of using the fallbacks as specified in the spec template.
    
    This adjustment makes the spec template fallbacks for the
    packager identity work as expected.
    
    Signed-off-by: Neal Gompa <ngompa13@gmail.com>