Fix: Prevent null formKey being passed to LabelTag

LabelTag constructor requires string type for $for parameter

Added null check to generate unique ID when formKey is null

Fixes TypeError when FormGroup is created with null label and content without tag ID

Author: Vitexus

src/Ease/TWB4/FormGroup.php

@@ -45,6 +45,11 @@ public function __construct(
             $formKey = $id;
         }
 
+        // Ensure formKey is never null for LabelTag which requires string
+        if ($formKey === null) {
+            $formKey = 'formgroup_' . uniqid();
+        }
+
         $properties['class'] = 'form-group';
         parent::__construct(null, $properties);
         $this->addItem(new \Ease\Html\LabelTag($formKey, $label));