`ReactServerRenderingTransaction` doesn’t have a `checkpoint()`, so any component with `handleError()` crashes during server rendering. I tested on 15, but pretty sure this is in master as well.

Fiddle: https://jsfiddle.net/un1nqs0w/

cc @jimfb 

constructor() {
        super();
        this.state = {error: false};
      }
      
      render() {
        if (!this.state.error) {
          return <div>{this.props.children}</div>;
        }
        return <div>Error has been caught</div>;
      }
      
      unstable_handleError() {
        this.setState({error: true});
      }
    }
    class BrokenRender extends React.Component {