/**
  * Displays the status for the model passed as argument.
  * 
  * This method assumes that the status includes a metadata value called 'labelTemplate' that contains
  * the HTML template of the rendering status. In this template the string '{label}' will be replaced by the 
  * status label.
  * 
  * Example : 
  *		'status' => [
  *			'draft' => [
  *				'label' => 'Draft',
  *				'transition' => ['ready' ],
  *				'metadata' => [
  *					'labelTemplate' => '<span class="label label-default">{label}</span>'
  *				]
  *			],
  * 
  * @param BaseActiveRecord $model
  * @return string|NULL the HTML rendered status or null if not labelTemplate is found
  */
 public static function renderLabel($model)
 {
     if ($model->hasWorkflowStatus()) {
         $labelTemplate = $model->getWorkflowStatus()->getMetadata('labelTemplate');
         if (!empty($labelTemplate)) {
             return strtr($labelTemplate, ['{label}' => $model->getWorkflowStatus()->getLabel()]);
         }
     }
     return null;
 }