Tep_not_null is_object update
Tep_not_null is_object update

Changed tep_not_null so to chcek if value is object because it returned warnings such as:

Warning: strtolower() expects parameter 1 to be string, object given in
and
Warning: trim() expects parameter 1 to be string, object given in
scottcwilson/oscommerce2,haraldpdl/oscommerce2,osCommerce/oscommerce2,haraldpdl/oscommerce2,osc2nuke/oscommerce2,osCommerce/oscommerce2,osc2nuke/oscommerce2,ruden/oscommerce2,scottcwilson/oscommerce2,ruden/oscommerce2