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**Do you want to request a *feature* or report a *bug*?**

Bug.

**What is the current behavior?**

Creating an `<input type='submit'` with `value={undefined}` results in a button with no text. https://codesandbox.io/s/nn7p94y3rl

The same behaviour can be seen with `type='reset'`

I have a PR open with a proposed fix. https://github.com/facebook/react/pull/12780

**What is the expected behavior?**

The input should use the browser's default value for the input (Submit for en, etc.).

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

React 16.3.2. Chrome 66.0.3359.139. macOS 10.13.4. Works in React 15 (unsure of earlier versions)

ReactDOM.render(<input type="radio" checked={true} />, container),
    ).toWarnDev(
      'Warning: A component is changing an uncontrolled input of type radio to be controlled. ' +
        'Input elements should not switch from uncontrolled to controlled (or vice versa). ' +
        'Decide between using a controlled or uncontrolled input ' +
        'element for the lifetime of the component. More info: https://fb.me/react-controlled-components\n' +
        '    in input (at **)',
    );
  });
  it('should warn if uncontrolled radio (checked is null) switches to controlled', () => {
    const stub = <input type="radio" checked={null} />;
    ReactDOM.render(stub, container);
    expect(() =>
      ReactDOM.render(<input type="radio" checked={true} />, container),
    ).toWarnDev(
      'Warning: A component is changing an uncontrolled input of type radio to be controlled. ' +
        'Input elements should not switch from uncontrolled to controlled (or vice versa). ' +
        'Decide between using a controlled or uncontrolled input ' +
        'element for the lifetime of the component. More info: https://fb.me/react-controlled-components\n' +
        '    in input (at **)',
    );
  });
  it('should not warn if radio value changes but never becomes controlled', () => {
    ReactDOM.render(<input type="radio" value="value" />, container);
    ReactDOM.render(<input type="radio" />, container);
    ReactDOM.render(
      <input type="radio" value="value" defaultChecked={true} />,
      container,
    );
    ReactDOM.render(