Don't query Media if null

[martin-ro]

Every time we pass null to a glider component a query is fired to see if a Media record exists.

It would be better to use the fallback (if defined) right away when $media is not integer.

[awcodes]

There was a recent merge to allow for uuid / ulid id's, so is_int() isn't going to work here. Maybe check for null instead?

[martin-ro]

Okay, if uuid's are supported checking for null is better. Should be good now?

[awcodes]

Thanks