title: Swift 3 - Crashing after numberOfRowsInSection in TableView
body: <p>I migrated to Swift 3.0 from 2.3 today and I fixed all the compiler error messages, but I am having issues with one <code>TableView</code>. I put a breakpoint after all the datasource methods after I call <code>reloadData()</code> and it enters <code>numberOfSections</code> but crashes after it leaves <code>numberOfRowsInSection</code>. <code>cellForRowAt</code> is never hit. It crashes in the <code>AppDelegate</code>, so I am not sure what that is all about. </p>
  
  <p>I did not previously have this issue when running Swift 2.3, unless the automatic conversion to 3.0 did something to this particular <code>TableView</code>. My other <code>TableView</code>s are functioning fine.</p>
  
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