[TimePicker] uncontrolled timepicker doesn't work

[hmeerlo]

Problem Description

I just tried out 0.15.0-alpha.2 and found out that my TimePicker's no longer function. All TimePickers are regarded as controlled instances because the following function is incorrect:

  _isControlled() {
    return this.props.value !== null;
  },

So if value is undefined (which it is in my case because I set defaultTime) then the picker thinks it is a controlled instance.

Versions

• Material-UI: 0.15.0-alpha.2
• React: 0.14.7
• Browser: Chrome 49.0.2623.87