Include answer to open questions about error on empty select

packages/scenario/test/smoketests/form-init.test.ts

@@ -328,6 +328,15 @@ describe('Form initialization smoke tests', () => {
  * We do not currently produce an error when a `<select>` or `<select1>` has
  * no options/items.
  *
+ * Original notes included a couple open questions (preserved below for
+ * context). Answer
+ * {@link https:/getodk/web-forms/pull/110#discussion_r1614153820 | from review}:
+ *
+ * > This is for the very specific case where a select has no inline choices
+ * > and no valid reference to a secondary instance.
+ *
+ * - - -
+ *
  * Open questions:
  *
  * - Does this expectation apply to `<itemset>`s?