[Bug] End of month cleanup error (#1750)

* check for null carryover

* release note

* simplify logic

packages/loot-core/src/server/budget/cleanup-template.ts

@@ -57,6 +57,10 @@ async function processCleanup(month: string): Promise<Notification> {
       [db_month, categoryId],
     );
 
+    if (carryover === null) {
+      carryover = { carryover: 0 };
+    }
+
     if (
       balance < 0 &&
       Math.abs(balance) <= budgetAvailable &&

upcoming-release-notes/1750.md

@@ -0,0 +1,6 @@
+---
+category: Bugfix
+authors: [shall0pass]
+---
+
+End of month cleanup - fixed condition that caused an error with null carryover value