fix bug when saving non-text notes

src/services/consistency_checks.js

@@ -209,6 +209,16 @@ async function runAllChecks() {
             AND type != 'relation-map'`,
         "Note has invalid type", errorList);
 
+    await runCheck(`
+          SELECT
+            noteId
+          FROM
+            notes
+          WHERE
+            isDeleted = 0
+            AND content IS NULL`,
+        "Note content is null even though it is not deleted", errorList);
+
     await runCheck(`
           SELECT 
             parentNoteId