Make behavior consistent when equipping slotfully and slotlessly

[s-k-z]

Somewhat unexpected behavior:

> js [].every((e)=>true);

Returned: true

> js [].some((e) => true);

Returned: false

By short circuiting this we get consistent equipping success/failure for both equipping an empty array with and without a slot specified.

[Kasekopf]

Thanks!