[CTIS] Make split_options
return list of character missing if all input values are NA
#1446
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Description
General version of #1435 (see this comment) so that we don't need to add compensatory logic to handle the case when all values for a survey question are missing (
NA
).Changelog
split_options
.split_options
output to list format.code_vaccines
split_options
behavior on character missing and logical missing.is_selected
behavior on character missing and logical missing too.