check amp-ad iframe_ is null (#3670)
check amp-ad iframe_ is null (#3670)


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-os/amphtml,amoad-amoe/amphtml,pietergreyling/amphtml,taboola/amphtml,cvializ/amphtml,DistroScale/amphtml,mlb7687/amphtml,alanorozco/amphtml,wjfang/amphtml,jlucero-contentad/amphtml,spotxchange/amphtml,DAC-f1h-dev/amphtml,lannka/amphtml,dvoytenko/amphtml,clawr/amphtml,ericlindley-g/amphtml,rlugojr/amphtml,ADITION/amphtml,alanorozco/amphtml,gumgum/amphtml,rifler/amphtml,lzanol/amphtml,Adtoma/amphtml,jridgewell/amphtml,DistroScale/amphtml,widespace-os/amphtml,ecoron/amphtml,mlb7687/amphtml,nexxtv/amphtml,vmarteev/amphtml,aghassemi/amphtml,ruturajv-media-net/amphtml,jasti/amphtml,lannka/amphtml,donttrustthisbot/amphtml,zhangsu/amphtml,devjsun/amphtml,burtcorp/amphtml,interspacejp/amphtml,yieldbot/amphtml,prateekbh/amphtml,engtat/amphtml,jdelhommeau/amphtml,yieldmo/amphtml,kmh287/amphtml,zhouyx/amphtml,AaronCritchley/amphtml,arealit/amphtml,DarXector/amphtml,vmarteev/amphtml,ruturajv-media-net/amphtml,powdercloud/amphtml,mlb7687/amphtml,jmadler/amphtml,Gregable/amphtml,pedjoni8/amphtml,techhtml/amphtml,zhouyx/amphtml,taboola/amphtml,ampproject/amphtml,sharethrough/amphtml,lzanol/amphtml,adiant/amphtml,mhc-gh/amphtml,kmh287/amphtml,cory-work/amphtml,keithwrightbos/amphtml,mhc-gh/amphtml,alanorozco/amphtml,Mixpo/amphtml,donttrustthisbot/amphtml,honeybadgerdontcare/amphtml,smartadserver/amphtml,engtat/amphtml,sharethrough/amphtml,yandex-pcode/amphtml,sharethrough/amphtml,lannka/amphtml,dotandads/amphtml,JuliusThms/amphtml,sharethrough/amphtml,DarXector/amphtml,devjsun/amphtml,jmadler/amphtml,voyagegroup/amphtml,rlugojr/amphtml,jdelhommeau/amphtml,dvoytenko/amphtml,arealit/amphtml,kamtschatka/amphtml,gumgum/amphtml,rifler/amphtml,sklobovskaya/amphtml,powdercloud/amphtml,AaronCritchley/amphtml,zhangsu/amphtml,ericlindley-g/amphtml,lannka/amphtml,tlong2/amphtml,AaronCritchley/amphtml,kmh287/amphtml,interspacejp/amphtml,cory-work/amphtml,amoad-amoe/amphtml,jpettitt/amphtml,lzanol/amphtml,kmh287/amphtml,chaveznvg/amphtml,jasti/amphtml,jlucero-contentad/amphtml,burtcorp/amphtml,rlugojr/amphtml,camelburrito/amphtml,jpettitt/amphtml,kixer-com/amphtml,media-net/amphtml,jridgewell/amphtml,jpettitt/amphtml,DarXector/amphtml,laterpay/amphtml,keithwrightbos/amphtml,burtcorp/amphtml,sortable/amphtml,techhtml/amphtml,lannka/amphtml,lzanol/amphtml,danielrozenberg/amphtml,fullspeed-sp/amphtml,pedjoni8/amphtml,danielrozenberg/amphtml,danielrozenberg/amphtml,jridgewell/amphtml,aghassemi/amphtml,dvoytenko/amphtml,sklobovskaya/amphtml,danielrozenberg/amphtml,rajkumarsrk/amphtml,koshka/amphtml,techhtml/amphtml,sriramkrish85/amphtml,kmh287/amphtml,spotxchange/amphtml,taboola/amphtml,widespace-os/amphtml,alanorozco/amphtml,dotandads/amphtml,BenDz/amphtml,jasti/amphtml,camelburrito/amphtml,BrightcoveOS/amphtml,rajkumarsrk/amphtml,ampproject/amphtml,criteo-forks/amphtml,keithwrightbos/amphtml,Gregable/amphtml,ericlindley-g/amphtml,jmadler/amphtml,yieldbot/amphtml,cory-work/amphtml,media-net/amphtml,vmarteev/amphtml,Gregable/amphtml,tdrl/amphtml,luciancrasovan/amphtml,jridgewell/amphtml,src-code/amphtml,adiant/amphtml,luciancrasovan/amphtml,alanorozco/amphtml,gumgum/amphtml,rajkumarsrk/amphtml,spotxchange/amphtml,Lith/amphtml,rifler/amphtml,lannka/amphtml,kamtschatka/amphtml,shawnbuso/amphtml,amoad-amoe/amphtml,jridgewell/amphtml,danielrozenberg/amphtml,sklobovskaya/amphtml,sriramkrish85/amphtml,wjfang/amphtml,clawr/amphtml,sebastianbenz/amphtml,prateekbh/amphtml,DarXector/amphtml,sortable/amphtml,avimehta/amphtml,keithwrightbos/amphtml,adup-tech/amphtml,avimehta/amphtml,kamtschatka/amphtml,sortable/amphtml,mlb7687/amphtml,lzanol/amphtml,britice/amphtml,honeybadgerdontcare/amphtml,yevheniiminin/amphtml,shawnbuso/amphtml,yandex-pcode/amphtml,sortable/amphtml,comScore/amphtml,jpettitt/amphtml,powdercloud/amphtml,sriramkrish85/amphtml,zhucl/amphtml,ericlindley-g/amphtml,Mobusi-ads/amphtml,arealit/amphtml,smartadserver/amphtml,arealit/amphtml,dvoytenko/amphtml,cvializ/amphtml,laterpay/amphtml,adiant/amphtml,cory-work/amphtml,pietergreyling/amphtml,rifler/amphtml,lzanol/amphtml,nexxtv/amphtml,jdelhommeau/amphtml,sortable/amphtml,zhangsu/amphtml,BrightcoveOS/amphtml,jdelhommeau/amphtml,powdercloud/amphtml,zhangsu/amphtml,chaveznvg/amphtml,prateekbh/amphtml,keithwrightbos/amphtml,engtat/amphtml,luciancrasovan/amphtml,AaronCritchley/amphtml,pedjoni8/amphtml,shawnbuso/amphtml,jasti/amphtml,powdercloud/amphtml,yieldmo/amphtml,shawnbuso/amphtml,pedjoni8/amphtml,spotxchange/amphtml,cory-work/amphtml,honeybadgerdontcare/amphtml,adiant/amphtml,danielrozenberg/amphtml,jlucero-contentad/amphtml,donttrustthisbot/amphtml,techhtml/amphtml,triplelift/amphtml,adtechnology/amphtml,ruturajv-media-net/amphtml,BenDz/amphtml,sebastianbenz/amphtml,comScore/amphtml,media-net/amphtml,rsimha-amp/amphtml,vmarteev/amphtml,tlong2/amphtml,rajkumarsrk/amphtml,donttrustthisbot/amphtml,bpaduch/amphtml,camelburrito/amphtml,amoad-amoe/amphtml,mhc-gh/amphtml,cvializ/amphtml,Mixpo/amphtml,yieldmo/amphtml,spotxchange/amphtml,jpettitt/amphtml,mlb7687/amphtml,clawr/amphtml,devjsun/am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