fix(admin-ui): Allow backorder update on variants (#4051)

packages/admin-ui/ui/src/utils/remove-nullish.ts

@@ -1,2 +1,11 @@
-export const removeNullish = (obj: Record<string, unknown>) =>
+export const removeFalsy = (obj: Record<string, unknown>) =>
   Object.entries(obj).reduce((a, [k, v]) => (v ? ((a[k] = v), a) : a), {})
+
+// == null is also true for undefined
+export const removeNullish = (
+  obj: Record<string, unknown>
+): Record<string, unknown> =>
+  Object.entries(obj).reduce(
+    (a, [k, v]) => (v != null ? ((a[k] = v), a) : a),
+    {}
+  )