Fix page crash when an iframe is invalid
The GIST embed has triggered an existing bug in the embedded player index file. GIST does not have iframe and thus its code didn't include an iframe url validator.
This should fix for future plugins too.
The GIST embed has triggered an existing bug in the embedded player index file. GIST does not have iframe and thus its code didn't include an iframe url validator.
This should fix for future plugins too.