Should 'isset()' take empty arrays into account?

[AFoeee]

I wonder whether it would make sense for isset() to take empty arrays into account?

If I correctly understand the application, it is used to check if a widget field is undefined, null or ''.
However, unpopulated media-input-fields with a "multiple" parameter set to true, can return an empty array, right?
(At least I get an empty array, when I delete all existing videos from a 'video-input' field.)

Of course, a user could simply implement something like the following:

// Uses the input of a media field to test whether media was added to it.
function isMediaFieldPopulated(input) {
  return (input && (Array.isArray(input) ? (input.length > 0) : true));
}

[reboot0-de]

The isset function was made in reference to the PHP counterpart.
For the specific case of this toolset, I just added an option to check for empty strings as well.
What you mean would be something like empty, but that is a very blunt function and might introduce some unexpected bugs, so I decided against it.

But yeah, I might add something specifically for (multiple) media-inputs in the future.
There are a few things I wanted to update anyways, when I find some time.