Update Convex with no payload to be just like convex with payload but without payload

packages/ui/tests/component/button.test.tsx

@@ -0,0 +1,13 @@
+import { render, screen } from '@testing-library/react';
+import { describe, expect, it } from 'vitest';
+
+import { Button } from '../../src/button';
+
+describe('Button', () => {
+  it('renders its children', () => {
+    render(<Button>Click me</Button>);
+    expect(
+      screen.getByRole('button', { name: 'Click me' }),
+    ).toBeInTheDocument();
+  });
+});