fix empty utm cookie value (#2579)
fix empty utm cookie value (#2579)


edx/ecommerce,edx/ecommerce,eduNEXT/edunext-ecommerce,edx/ecommerce,eduNEXT/edunext-ecommerce,eduNEXT/edunext-ecommerce,eduNEXT/edunext-ecommerce,edx/ecommerce