Correctly filter empty elements in String::resolveFlaggedUrl()

Author: leofeyer

system/modules/core/library/Contao/String.php

@@ -660,6 +660,11 @@ public static function resolveFlaggedUrl(&$url)
 
 		for ($i=1; $i<count($chunks); $i++)
 		{
+			if (empty($chunks[$i]))
+			{
+				continue;
+			}
+
 			switch ($chunks[$i])
 			{
 				case 'static':
@@ -670,10 +675,6 @@ public static function resolveFlaggedUrl(&$url)
 					$options->async = true;
 					break;
 
-				case empty($chunks[$i]):
-					// Ignore
-					break;
-
 				case is_numeric($chunks[$i]):
 					$options->mtime = $chunks[$i];
 					break;