old_contents: import React, { Component, PropTypes } from 'react'
  
  export default class Status extends Component {
    render() {
      var since = this.props.status + " since " + this.props.since
      return (
        <span title={since} >{this.props.status}</span>
      )
    }
  }
  
  Status.propTypes = {
    status: PropTypes.string.isRequired,
    since: PropTypes.string.isRequired
  }
  
new_contents: import React, { Component, PropTypes } from 'react'
  
  export default class Status extends Component {
    render() {
      var since = (this.props.since ? this.props.status + " since " + this.props.since : "")
      return (
        <span title={since} >{this.props.status}</span>
      )
    }
  }
  
  Status.propTypes = {
    status: PropTypes.string.isRequired,
    since: PropTypes.string
  }
  
subject: update component to not require a since value