title: opencart 3.0.2.0 remove model required restriction
body: <p>How can i remove the "model required" from the model field in admin product page in opencart v 3.0.2.0, and make it an optional field like the rest of the fields in the data tab?
  <a href="https://i.stack.imgur.com/8XmZr.png" rel="nofollow noreferrer">model required screenshot</a></p>