feature not calculated after filtering

[robjhyndman]

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(feasts)
#> Loading required package: fabletools
tsibbledata::gafa_stock %>%
  features(Close, ljung_box, lag = 10)
#> # A tibble: 4 x 3
#>   Symbol lb_stat lb_pvalue
#>   <chr>    <dbl>     <dbl>
#> 1 AAPL    12299.         0
#> 2 AMZN    12415.         0
#> 3 FB      12322.         0
#> 4 GOOG    12326.         0
tsibbledata::gafa_stock %>%
  filter(Symbol == "GOOG") %>%
  features(Close, ljung_box, lag = 10)
#> Warning: 1 error encountered for feature 1
#> [1] 'ts' object must have one or more observations
#> # A tibble: 1 x 1
#>   Symbol
#>   <chr> 
#> 1 GOOG

^{Created on 2019-09-24 by the reprex package (v0.3.0)}