title: Odoo 13 API how to save null search results as a string
body: <p>I am using the Odoo 13 api as such.</p>
  <pre><code>  wanted_ids= models.execute_kw(db, uid, password,
                                          'res.partner', 'search_read',
                                          [[['name', '=',False]]],
                                              )
      print(wanted_ids)
  </code></pre>
  <p>as expected nothing is returned.</p>
  <pre><code>[]
  </code></pre>
  <p>What I want instead of null</p>
  <pre><code>['Nothing found']
  </code></pre>
  <p>I am not sure how to approach this. I have tried to raise exceptions but this does not save to the <code>wanted_ids</code> variable.</p>