If you call this
ads.show( "interstitial")
the listener returns event.isError=true if there is no ad, but
ads.show( "interstitial", { appId = ADMOB\_FULL } )
the event.isError=false when there is no ad.
ADMOB_FULL is the ad id from admob dashboard (ca-app-pub-…)
So I can’t use this to show replacement ad if there is no ad.