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[fixed] check if focusLaterElements is empty before popping

Without a check to see if the focusLaterElements array is empty, we
end up calling `pop()` on an empty array—resulting in an undefined
value—and inadvertently jump to the `catch` block when we attempt to
call `focus()` on `undefined`.

This ensures that if there are no existing elements to return focus to
once our modal is closed (this happens often in a testing env), we do
not throw a TypeError by accident.

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