Skip font availability check if no font given

R/theme_pomological.R

   axis.text.size = base_size * 14/16,
   base_theme = ggplot2::theme_minimal()
 ) {
-  check_font(base_family)
+  if (!is.null(base_family)) check_font(base_family)
   
   base_theme + 
     ggplot2::theme(