Fixed so boolean values being stored on update store '0' instead of null if previous was empty.
Fixed so boolean values being stored on update store '0' instead of null if previous was empty.

Signed-off-by: Paul Hughes <a027184a55211cd23e3f3094f1fdc728df5e0500@paulalexanderhughes.com>

ishan576/wordpress-plugin,muut/wordpress-plugin,ishan576/wordpress-plugin,muut/wordpress-plugin