title: Dynamic number of list is showing errorin django pagination?
body: <p>Code listing:</p>
  
  <pre><code>list = request.GET.get('list')
  paginator = Paginator(categories_list, list)
  </code></pre>
  
  <p>During run raise exception:</p>
  
  <blockquote>
    <p>int() argument must be a string, a bytes-like object or a number, not 'NoneType'</p>
  </blockquote>