That function only works on tabs designed for it.

You need to modify the tab to return nothing if there is no videos.

Here's an example if it uses a database:
[code:1]
if (count($videos)==0){
return;
} else {
return $content;
}
[/code:1]

I don't know.

I just gave you an example. I don't know what plugin you use. I use seyret so can't really help ya with anything other then that.

You'll just have to look at the plugin and check out how it handles displaying the information. Then make a new if statement to return something or nothing depending what was pulled from the database.