SetData action check for if a field exists may fail with false positives
>>> [!note] Migrated issue
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<!-- Migrated from issue #3421270. -->
Reported by: [luke.leber](https://www.drupal.org/user/3509746)
Related to !3
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The <code>SetData</code> action access check uses the <code>WebformSubmission::getElementData</code> method to determine if an element exists. Some element's values may be null.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<ol>
<li>Set up a webform with a Value element.</li>
<li>Create a new ECA model that creates a new submission and attempts to set the Value element.</li>
<li>Notice that access will be denied.</li>
</ol>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Use <code>WebformSubmission::getWebform()->getElement()</code> instead to check if an element exists.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<ol>
<li>Confirm the issue exists.</li>
<li>Open a MR.</li>
<li>Review.</li>
<li>Merge.</li>
</ol>
<h3 id="summary-ui-changes">User interface changes</h3>
<p>None</p>
<h3 id="summary-api-changes">API changes</h3>
<p>None</p>
<h3 id="summary-data-model-changes">Data model changes</h3>
<p>None</p>
issue