Always send an error to client if there is.

[arunoda]

Fixes #1798
In the production, we need to send a dummy error.

[gcpantazis]

@arunoda So the error won't be sent to the view in production? What if I want to take an action?

My use case is that I want to send that error message to our logs, and the _error.js page is the best single place I see to capture errors that break next on both the client and server. i.e.:

export default class ErrorPage extends React.Component {
    static getInitialProps({res, jsonPageRes, err}) {
        if (err) {
            track.metric('render_error');
            // Utility method that serializes JS errors on client and server, sends them to logs
            track.error(err);
        }

        return {}
    }

    render() {
        return (
            <div>...</div>
        )
    }
}

If we're not consistently sending the error object to the error page, do you have a better way to grab and track them?

[arunoda]

Basically this is intentional. Earlier we haven't sent it at all.
In production, we don't want to send server errors to the client.