React 0.14.7: `<option value="">empty</option>` emits empty string on change
http://jsbin.com/pisita/10/edit?html,js,console,output
React 15.0.0-rc.1`<option value="">empty</option>` emits string with value "empty" on change
http://jsbin.com/bemaze/12/edit?html,js,console,output
This is because React 15.0.0-rc.1 cuts off `value=""` from option tag

var container = document.createElement('div');
    var stub = <input type="text" value="yolo" onChange={emptyFunction} />;
    stub = ReactDOM.render(stub, container);
    var node = ReactDOM.findDOMNode(stub);
    expect(node.value).toBe('yolo');
    stub = ReactDOM.render(
      <input type="text" value={false} onChange={emptyFunction} />,
      container
    );
    expect(node.value).toEqual('false');
  });
  it('should allow setting `value` to `objToString`', function() {
    var container = document.createElement('div');
    var stub = <input type="text" value="foo" onChange={emptyFunction} />;
    stub = ReactDOM.render(stub, container);
    var node = ReactDOM.findDOMNode(stub);
    expect(node.value).toBe('foo');
    var objToString = {
      toString: function() {
        return 'foobar';
      },
    };
    stub = ReactDOM.render(
      <input type="text" value={objToString} onChange={emptyFunction} />,
      container
    );
    expect(node.value).toEqual('foobar');
  });
  it('should properly control a value of number `0`', function() {
    var stub = <input type="text" value={0} onChange={emptyFunction} />;