🐛(editor) fix TypeError in document editor

I get

> TypeError: Cannot use 'in' operator to search for 'de' in undefined

when building MIT-only since `localesBNAI` is undefined then.

Signed-off-by: Maximilian Bosch <maximilian@mbosch.me>

Author: Ma27

src/frontend/apps/impress/src/features/docs/doc-editor/components/BlockNoteEditor.tsx

@@ -52,7 +52,7 @@ import {
 const AIMenu = BlockNoteAI?.AIMenu;
 const AIMenuController = BlockNoteAI?.AIMenuController;
 const useAI = BlockNoteAI?.useAI;
-const localesBNAI = BlockNoteAI?.localesAI;
+const localesBNAI = BlockNoteAI?.localesAI || {};
 import {
   InterlinkingLinkInlineContent,
   InterlinkingSearchInlineContent,