title: FullCalendar ListWeek view throwing error when event is in multiweek
body: <p>I have an event starting 1/26/2018 and ending on 1/28/2018. </p>
  
  <p><img src="https://i.stack.imgur.com/AaMii.png" alt="Calendar Month View"></p>
  
  <p>When I go to ListWeek view, I am getting following error.</p>
  
  <pre><code>Uncaught TypeError: Cannot read property 'startMs' of undefined
  throws at ... fullcalendar.js:17616:61 TypeError: Cannot read property 
  'startMs' of undefined
  at members.constructor.componentFootprintToSegs (fullcalendar.js:17616)
  at members.constructor.eventFootprintToSegs (fullcalendar.js:5238)
  at members.constructor.eventFootprintsToSegs (fullcalendar.js:5217)
  at members.constructor.renderEventsPayload (fullcalendar.js:5527)
  at members.constructor.callChildren (fullcalendar.js:4866)
  at members.constructor.renderEventsPayload (fullcalendar.js:4427)
  at members.constructor.executeEventsRender (fullcalendar.js:10241)
  at eval (fullcalendar.js:9917)
  at constructor.runTaskFunc (fullcalendar.js:2506)
  at constructor.runTask (fullcalendar.js:2636)
  </code></pre>
  
  <p><code>ListWeek</code> is working fine if event in within the week range but throws error if event spread across multiple weeks.</p>
  
  <p>I get same error on <code>ListMonth</code> if even spreads in multiple month.</p>
  
  <p>Is it a bug?</p>