Missing currency conversion for Zambia and Cambodia.

[rfrelat]

I couldn't understand why currency_conversion_lcu_to_ppp is missing for Zambia, while querywb_stats() seems to report a number. With online database query, there can be unexpected errors.
For Cambodia, the project don't have a reported year (nor a id_form) so that's why the currency_conversion_lcu_to_ppp is missing.
So far, I manually used:
convlist <- list(
"cambodia_2019"=1490.945, #querywb_stats(2019, "cambodia")
"zm_faw_2019"=4.751562, #querywb_stats(2019, "zambia")
"zm_giz_2018"=4.432117, #querywb_stats(2018, "zambia")
"zm_scn_2017"=4.223818 #querywb_stats(2017, "zambia")
)