group_by combined with frq() is excluding NAs from group variables, but I want to keep them

Question

I'm outputting summary statistics using frq() because my dataset has haven labels that I want displayed. I found that when I used group_by and run this, however, the output excludes groups with missing values. Reproducible example:

library(dplyr)
library(sjmisc)

look<-cars
    look<-look %>% mutate(color=case_when(
      speed > 10 ~ 'red',
      TRUE ~ 'blue'
    ))
 temp<-data.frame(speed=12,dist=12)
 look<-bind_rows(look,temp)
 rm(temp)
    
 look<-look %>% group_by(color) %>% frq(speed)
 look<-as.data.frame(look)
 sum(look$frq)

[1] 50

Here we see that only 50 rows are summarized and the one with is.na(color) is excluded.

Is there any way to get groups with NA to show?

Thanks!