fixes #4026
Compare changes
<?php if (!$values['locked'] && $element['assignable'] && in_array($element['id'], $studyareas ?: [])) : ?>
<?= Icon::create('trash', 'clickable')->asInput(["name" => 'unassign['.$element['id'].']', "onclick" => "return STUDIP.CourseWizard.unassignNode('".$element['id']."')"]) ?>
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