When or_other is used with localized choices, a cryptic error is returned

[lognaturel]

Software and hardware versions

https://github.com/XLSForm/pyxform/commit/129abe98c97025cb5b978125e5d2ba5c0c0f74f7

Problem description

A user reports seeing "Error: 'choices'" when using or_other with choices that have translations. This may be related to the recent change to always use itemsets for selects.

Steps to reproduce the problem

Expected behavior

Other information

I haven't tried to reproduce this yet.