Create an UndocumentedSite instance

@param {[int]}   id          Site ID
@param {[WPCOM]} wpcom       WPCOM instance

@return {{UndocumentedSite}} UndocumentedSite instance

@api public
function UndocumentedSite( id, wpcom ) {
	debug( 'UndocumentedSite', id );
	if ( ! ( this instanceof UndocumentedSite ) ) {
		return new UndocumentedSite( id, wpcom );
	}
	this.wpcom = wpcom;
	this._id = id;
}