Fixed array conversion for UTM report.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "umami",
-  "version": "2.10.2",
+  "version": "2.11.0",
   "description": "A simple, fast, privacy-focused alternative to Google Analytics.",
   "author": "Umami Software, Inc. <hello@umami.is>",
   "license": "MIT",

src/app/(main)/reports/utm/UTMView.tsx

@@ -7,7 +7,7 @@ import ListTable from 'components/metrics/ListTable';
 import styles from './UTMView.module.css';
 import { useMessages } from 'components/hooks';
 
-function toArray(data: { [key: string]: number }) {
+function toArray(data: { [key: string]: number } = {}) {
   return Object.keys(data)
     .map(key => {
       return { name: key, value: data[key] };