title: Codeception multiselect none - select no options
body: <p>I'm trying to test a multiselect having all of its options unselected. I've found how to select multiple options by passing through an array of options, but passing an empty array generates an error.</p>
  <pre class="lang-php prettyprint-override"><code>$I-&gt;selectOption('Helper', []);
  </code></pre>
  <pre><code>[PHPUnit\Framework\Error\Notice] Array to string conversion
  </code></pre>
  <p>Passing <code>null</code> doesn't work either:</p>
  <pre class="lang-php prettyprint-override"><code>$I-&gt;selectOption('Helper', null);
  </code></pre>
  <pre><code> [InvalidArgumentException] Input &quot;task[helpers]&quot; cannot take &quot;&quot; as a value (possible values: &quot;1&quot;, &quot;2&quot;, &quot;3&quot;, &quot;4&quot;).
  </code></pre>
  <p>Is there a way to deselect all options for a multiselect on a form that loads with some of its options already selected?</p>