should prepare_sector_split() only run when apply_sector_split = TRUE?

[cjyetman]

consider whether either...

in prepare_abcd(), prepare_sector_split() should only run conditionally if apply_sector_split = TRUE in the config

pacta.multi.loanbook/R/prepare_abcd.R

Line 22 in a973147

prepare_sector_split(config)

or if prepare_sector_split() should test that apply_sector_split = TRUE in the config and otherwise exit out immediately

(or both)

As it is now, prepare_abcd() will always run prepare_sector_split(), and prepare_sector_split() will error if the sector split CSV is not found even if apply_sector_split = FALSE in the config.