an nullish legend should not be displayed as tet "undefined" (#746)

fixes #745
observablehq · Feb 9, 2022 · 8bffb4b · 8bffb4b
1 parent 2545560
commit 8bffb4b
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/legends.js b/src/legends.js
@@ -76,7 +76,8 @@ export function Legends(scales, options) {
   for (const [key, value] of legendRegistry) {
     const o = options[key];
     if (o && o.legend) {
-      legends.push(value(scales[key], legendOptions(scales[key], o), key => scales[key]));
+      const legend = value(scales[key], legendOptions(scales[key], o), key => scales[key]);
+      if (legend != null) legends.push(legend);
     }
   }
   return legends;