Raise error when dates / date range are passed to things expecting weeks?

[brookslogan]

To give a better error/warning/result than this:

library(epidatr)
pub_flusurv(
  locations = "network_all",
  issues = epirange(as.Date("1234-01-01"), as.Date("3456-01-01"))
)
#> # A tibble: 0 × 0
#> Warning message:
#> epidata warning: `no results` 

(This only sometimes seems to give a warning about empty data? Maybe only when not caching?)

Alternatively, some sort of standardization might make this unnecessary.

[JavierMtzRdz]

I'm considering whether it's preferable to assert that the given parameters follow the required structure, for example by modifying assert_timeset_param to verify if issues is a weekly parameter for endpoints needing that format. Alternatively, I could convert dates to epiweeks or return an error after performing a check if data isn't returned.