Fix error when navigating past end of tags

[isaacws]

When using the arrow key to select tags, if you arrow past the last or
first tag a javascript error occurs "Uncaught TypeError: Cannot read
property 'target' of undefined "

[jgable]

Looks good to me 👍 . I mean, I'd prefer to just check at the top for no ev and return early with this.elements.input.focus() or something if possible.

What do you think @dansnetwork ?

[isaacws]

I just changed my repo to return early and skip the focus. It changes the behavior to stop and the end tags instead of turning to a cursor. Not sure which behavior is desired.

[jgable]

The indentation here is all wacky. And please always use { .. } with if statements.

[jgable]

Also, before the return, you should do this.elements.input.focus(); like the original code path did.

[dansnetwork]

The desired behavior is that it returns focus to the <input>.

[isaacws]

If we just wish to focus why do we even need these lines?

$closest = $(ev.target).closest('li'),
$data = $closest.data('ui-inputosaurus') || $closest.data('inputosaurus');
if(!ev || !$data){

Instead

_focus : function(ev) {
    var widget = (ev && ev.data.widget) || this;
    widget.elements.input.focus();
},

As for the indentation, my editor is set to use spaces instead of tabs. I'll update my source