fix(submissions): handle null blogPostId in populate query

- Changed populate to use options object with strictPopulate: false
- Allows submissions without blogPostId (standalone packages) to be returned
- Fixes 500 error on /api/submissions endpoint
- Le Monde package should now be visible in UI after server restart

src/controllers/submissions.controller.js

@@ -82,7 +82,11 @@ async function getSubmissions(req, res) {
     if (publicationId) query.publicationId = publicationId;
 
     const submissions = await SubmissionTracking.find(query)
-      .populate('blogPostId', 'title slug')
+      .populate({
+        path: 'blogPostId',
+        select: 'title slug',
+        options: { strictPopulate: false } // Allow null blogPostId
+      })
       .populate('createdBy', 'email')
       .sort({ submittedAt: -1, createdAt: -1 })
       .limit(parseInt(limit, 10))