fix zero budget values (#1308)

Closes #1299

<img width="324" alt="Screenshot 2023-07-07 at 18 56 38"
src="https://github.com/actualbudget/actual/assets/886567/1a4dbd65-52af-44d9-8205-94a4c6c745e5">

packages/desktop-client/src/components/spreadsheet/format.js

@@ -18,7 +18,7 @@ export default function format(value, type = 'string') {
       }
       return formatted;
     case 'financial':
-      if (value == null || value === '') {
+      if (value == null || value === '' || value === 0) {
         return integerToCurrency(0);
       } else if (typeof value === 'string') {
         const parsed = parseFloat(value);

upcoming-release-notes/1308.md

+---
+category: Bugfix
+authors: [MatissJanis]
+---
+
+Fix budget showing "--0.00" values sometimes