#859 Debug errors clean up
#859 Debug errors clean up

ref: https://wordpress.org/support/topic/undefined-index-ampforwp-seo-custom-additional-meta/

nicholasgriffintn/Accelerated-Mobile-Pages,ahmedkaludi/Accelerated-Mobile-Pages,ahmedkaludi/Accelerated-Mobile-Pages,nicholasgriffintn/Accelerated-Mobile-Pages