Validate selected inputs from data_extract before passing to data_merge to avoid
dplyr
errors or unexpected results.
check_data_merge_selectors(selector_list)
NULL
if check is successful and shiny
validate error otherwise.
(reactive
)
output from data_extract_multiple_srv()
or a reactive named list of
outputs from data_extract_srv()
.
When using a reactive named list, the names must be identical to the shiny
ids of the respective
data_extract_ui()
.