Requestion version with no data in grouped epix_slide() produces confusing error message

[brookslogan]

library(dplyr)
#> 
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#> 
#>     filter, lag
#> The following objects are masked from 'package:base':
#> 
#>     intersect, setdiff, setequal, union
library(epiprocess)
#> Loading required package: epidatasets
#> Registered S3 method overwritten by 'tsibble':
#>   method               from 
#>   as_tibble.grouped_df dplyr
#> 
#> Attaching package: 'epiprocess'
#> The following object is masked from 'package:stats':
#> 
#>     filter
case_death_rate_archive %>%
  group_by(geo_value) %>%
  epix_slide(
    .versions = min(.$private$ungrouped$DT$version),
    max_time_value = max(time_value)
  )
#> # A tibble: 56 × 3
#> # Groups:   geo_value [56]
#>    geo_value version    max_time_value
#>  * <chr>     <date>     <date>        
#>  1 ak        2020-09-01 2020-08-31    
#>  2 al        2020-09-01 2020-08-31    
#>  3 ar        2020-09-01 2020-08-31    
#>  4 as        2020-09-01 2020-08-31    
#>  5 az        2020-09-01 2020-08-31    
#>  6 ca        2020-09-01 2020-08-31    
#>  7 co        2020-09-01 2020-08-31    
#>  8 ct        2020-09-01 2020-08-31    
#>  9 dc        2020-09-01 2020-08-31    
#> 10 de        2020-09-01 2020-08-31    
#> # ℹ 46 more rows
case_death_rate_archive %>%
  group_by(geo_value) %>%
  epix_slide(
    .versions = min(.$private$ungrouped$DT$version) - 1L,
    max_time_value = max(time_value)
  ) %>%
  ungroup()
#> Warning in max.default(structure(numeric(0), class = "Date"), na.rm = FALSE):
#> no non-missing arguments to max; returning -Inf
#> Error in `group_by()`:
#> ! Must group by variables found in `.data`.
#> ✖ Column `geo_value` is not found.
case_death_rate_archive %>%
  epix_slide(
    .versions = min(.$DT$version) - 1L,
    max_time_value = max(time_value)
  )
#> Warning in max.default(structure(numeric(0), class = "Date"), na.rm = FALSE):
#> no non-missing arguments to max; returning -Inf
#> # A tibble: 1 × 2
#>   version    max_time_value
#> * <date>     <date>        
#> 1 2020-08-31 -Inf

^{Created on 2025-03-12 with reprex v2.1.1}

• First case is grouped, requesting a version containing data.
• Second case is grouped, requesting a version not containing any data. ---> confusing error message
• Third case is ungrouped, requesting a version not containing any data. ---> perhaps still confusing, but a little better.

This situation may arise when misremembering the bounds of an archive and requesting a version manually, or from issues copy-pasting code dealing with a different archive, or looping code over multiple archives with differing version ranges.