delete.php: fixed unwanted loose of MSG_CONTENT.

extension/qfq/api/delete.php

@@ -74,10 +74,11 @@ try {
         case MODE_HTML:
             if ($targetUrl === false || $targetUrl === '') {
                 $result[MSG_CONTENT] = 'Missing target URL. ' . ERROR_MISSING_VALUE;
+            } else {
+                $result[MSG_CONTENT] = '';
             }
 
             $result[MSG_HEADER] = "Location: $targetUrl";
-            $result[MSG_CONTENT] = '';
 
             break;