[fixed] Fatal error when trying to invoke the FE categories view

[jjk]

J1.7.1/VM2 SVN revision 4355
This error message was introduced with revision 4348 (work on the title tag for categories view?). A menu item linked to the categories view produces:

Fatal error: Class 'JParameter' not found in ...\components\com_virtuemart\views\categories\view.html.php on line 74
Line 74:         $menu_params = new JParameter( $menu->params );

[Studio 42]

fixed