Refactor ItemListsProvider
Refactor ItemListsProvider

Generate global fixtures separately from user fixtures. The order of returned fixtures is now global items sorted by data type tag then user items sorted by data type tag instead of all sorted by data type tag.

Removed `AttributeError` catch that was added in fee006c553786a8ac2ca1d89c0097d46316f6bae. Don't think it's relevant anymore.
dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq