No default values

[bradovichsrm]

There should be a default value if the name is not found. Currently it returns a 0x6 tibble but this prevents population of dataframes due to different lengths between function results and nrow(dataframe).

I.e.,
Error in mutate():
ℹ In argument: genderF = gender::gender(FIRST_NAME)["proportion_female"][[1]].
Caused by error:
! genderF must be size 2529603 or 1, not 2428427.