fix: general user settings empty when loading the settings page

Resolves https://kolaente.dev/vikunja/frontend/issues/2183

src/helpers/objectIsEmpty.ts

@@ -0,0 +1,6 @@
+// https://stackoverflow.com/a/32108184/10924593
+export function objectIsEmpty(obj: any): boolean {
+	return obj
+		&& Object.keys(obj).length === 0
+		&& Object.getPrototypeOf(obj) === Object.prototype
+}