Add add_if_missing parameter to control NA handling in interpretive rules (#264)

vignettes/EUCAST.Rmd

@@ -80,7 +80,7 @@ data <- tibble::tibble(
   CAZ = "-", # Ceftazidime
   CXM = "-", # Cefuroxime
   PEN = "S", # Benzylenicillin
-  FOX = "S"  # Cefoxitin
+  FOX = "S" # Cefoxitin
 )
 ```
 ```{r, eval = FALSE}