fix: do not generate invalid xy-cell when breakpoint is not found
fix: do not generate invalid xy-cell when breakpoint is not found

abdullahsalem/foundation-sites,zurb/foundation-sites,atmmarketing/foundation-sites,colin-marshall/foundation-sites,zurb/foundation-sites,abdullahsalem/foundation-sites,zurb/foundation-sites,colin-marshall/foundation-sites,denisahac/foundation-sites,dragthor/foundation-sites,abdullahsalem/foundation-sites,atmmarketing/foundation-sites,dragthor/foundation-sites,atmmarketing/foundation-sites,DaSchTour/foundation-sites,denisahac/foundation-sites,denisahac/foundation-sites,zurb/foundation,DaSchTour/foundation-sites,dragthor/foundation-sites,colin-marshall/foundation-sites,zurb/foundation,zurb/foundation