WP Scripts: Array key isset check

[bigdawggi]

Small patch for making sure the array key is set, before doing logic against it. Other plugins' code was generating a PHP Notice here, but this cleans up WP code to not throw PHP notice if some other plugin does something poorly.

[azaozz]

If that array key doesn't exist there probably are much bigger problems than a PHP notice. Not sure if it's worth it removing the notice as it would indicate that something is misusing WP_Scripts.

[nacin]

I would tend to agree. Hiding notices like these just makes it difficult for developers to debug their code. I think the notice is proper here.

[bigdawggi]

With those points, I can see the case for keeping the notice. There's a reason notices exist ;) Setting to "wontfix", feel free to re-open if necessary.