Validate that the function call is not empty in tool explorer
>>> [!note] Migrated issue
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<!-- Migrated from issue #3554785. -->
Reported by: [marcus_johansson](https://www.drupal.org/user/385947)
Related to !977
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>When the ToolExplorer checks for violations, any tool without any inputs would return NULL, rather then an object. So we need to validate this.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce (required for bugs, but not feature requests)</h4>
<p>Try to run a tool without an input, it will fail.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>Check if it is an object.</p>
issue