language: #formatListHelper: explicitly blank for null/undefined

Undefined isn't implied by empty() call so this is a behavioral
change, too.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/data/things/language.js b/src/data/things/language.js
index 82b08c9f..f20927a4 100644
--- a/src/data/things/language.js
+++ b/src/data/things/language.js
@@ -738,8 +738,8 @@ export class Language extends Thing {
   }
 
   #formatListHelper(array, processFn) {
-    // Empty lists are blank content.
-    if (empty(array)) {
+    // Empty lists, null, and undefined are blank content.
+    if (empty(array) || array === null || array === undefined) {
       return html.blank();
     }