removed default value and added warning if the package name could not be determined.

R/vis_objects.R

@@ -5,7 +5,7 @@
 #' @param package The name of the R package that defines the class(object).
 #' @param page The name of the page to add the object to.
 #' @param title An optional component title.
-add_vis_object <- function(dashboard, object, package = NULL, page = "default", title = NULL, ...){
+add_vis_object <- function(dashboard, object, package, page = "default", title = NULL, ...){
   sanitised_page <- i2dash:::.create_page_name(page)
   if (!(sanitised_page %in% names(dashboard@pages))) {
     warning(sprintf("i2dashboard does not contain a page named '%s'", sanitised_page))
@@ -17,8 +17,6 @@ add_vis_object <- function(dashboard, object, package = NULL, page = "default",
     return(dashboard)
   }
 
-  if(is.null(package)) package <- "unknown package name"
-
   # Create random component for RDS filename
   component_id <- paste0("obj_", stringi::stri_rand_strings(1, 6))
 
@@ -71,5 +69,9 @@ setMethod("add_component",
               return(dashboard)
             }
             package <- packageSlot(component)
+            if(is.null(package)) {
+              warning("The package name of this HTML widget could not be determined. The component was not added to the dashboard.")
+              return(dashboard)
+            }
             add_vis_object(dashboard, component, package, page, title, ...)
             })