Fixed issue #14362: Template can throw error with invalid image

Dev: test if file exist before send it to imageValidator
Dev: add commment on validateImage function (this can be updated if needed, but not really the task of a image validation)
Dev: or did image validation must test if file exist ?

application/core/LSYii_ImageValidator.php

@@ -17,9 +17,10 @@
 class LSYii_ImageValidator
 {
     /**
-    * A function to validate images
+    * A function to validate images,
+    * This don't validate file : must validate if file exist before.
     *
-    * @param mixed $path
+    * @param string $path
     * @return array
     */
     static function validateImage($path)

application/core/LS_Twig_Extension.php

@@ -271,11 +271,14 @@ public static function image($sImagePath, $alt = '', $htmlOptions = array( ))
         if ($oTemplate) {
             $sFullPath = $oTemplate->path.$sImagePath;
         } else {
+            if(!is_file(Yii::app()->getConfig('rootdir').'/'.$sImagePath)) {
+                return false;
+            }
             $sFullPath = Yii::app()->getConfig('rootdir').'/'.$sImagePath;
         }
 
         // check if this is a true image
-        $checkImage = LSYii_ImageValidator::validateImage($sFullPath  );
+        $checkImage = LSYii_ImageValidator::validateImage($sFullPath);
 
         if (!$checkImage['check']) {
             return false;