NonParametric distributions fail check_stan_delays() run

[jamesmbaazam]

I noticed this error when I was trying to run the reprex in #735. Here's a reprex:

install.packages("EpiNow2", repos = c("https://epiforecasts.r-universe.dev", getOption("repos")))
#> Installing package into '/Users/lshja16/Library/R/arm64/4.4/library'
#> (as 'lib' is unspecified)
#> 
#> The downloaded binary packages are in
#>  /var/folders/vr/dn4r1_zj417drd1zr9301trw0000gp/T//RtmpzmFBEf/downloaded_packages
library(EpiNow2)
#> 
#> Attaching package: 'EpiNow2'
#> The following object is masked from 'package:stats':
#> 
#>     Gamma
# Passing NonParametric distributions leads to an error
try(generation_time_opts(dist = NonParametric(rep(0.1, 10))))
#> Error in get_parameters(dist, id) : 
#>   Cannot get parameters of a nonparametric distribution.
# hence epinow() fails
try(epinow(
  data = example_confirmed,
  generation_time = gt_opts(dist = NonParametric(rep(0.1, 10)))
  )
)
#> Logging threshold set at INFO for the EpiNow2 logger
#> Writing EpiNow2 logs to the console and: /var/folders/vr/dn4r1_zj417drd1zr9301trw0000gp/T//RtmpzmFBEf/regional-epinow/2020-06-30.log
#> Logging threshold set at INFO for the EpiNow2.epinow logger
#> Writing EpiNow2.epinow logs to the console and: /var/folders/vr/dn4r1_zj417drd1zr9301trw0000gp/T//RtmpzmFBEf/epinow/2020-06-30.log
#> Error in get_parameters(dist, id) : 
#>   Cannot get parameters of a nonparametric distribution.

^{Created on 2024-08-20 with reprex v2.1.1}