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

accept: 0,
    acceptCharset: 0,
    accessKey: 0,
    action: 0,
    allowFullScreen: HAS_BOOLEAN_VALUE,
    allowTransparency: 0,
    alt: 0,
    async: HAS_BOOLEAN_VALUE,
    autoComplete: 0,
    
    
    autoPlay: HAS_BOOLEAN_VALUE,
    capture: HAS_BOOLEAN_VALUE,
    cellPadding: 0,
    cellSpacing: 0,
    charSet: 0,
    challenge: 0,
    checked: MUST_USE_PROPERTY | HAS_BOOLEAN_VALUE,
    cite: 0,
    classID: 0,
    className: 0,
    cols: HAS_POSITIVE_NUMERIC_VALUE,
    colSpan: 0,
    content: 0,
    contentEditable: 0,
    contextMenu: 0,
    controls: HAS_BOOLEAN_VALUE,
    coords: 0,
    crossOrigin: 0,
    data: 0,