Merge pull request #13277 from backstage/blam/owner-picker

scaffolder: Fix empty string handling in `EntityPicker`

.changeset/dry-games-end.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder': patch
+---
+
+Fix bug with empty strings in `EntityPicker`

plugins/scaffolder/src/components/fields/EntityPicker/EntityPicker.tsx

@@ -72,7 +72,7 @@ export const EntityPicker = (
 
   const onSelect = useCallback(
     (_: any, value: string | null) => {
-      onChange(value || '');
+      onChange(value ?? undefined);
     },
     [onChange],
   );