title: "Object reference not set to an instance of an object" when publishing a sql project VS 2013
body: <p>When I try to publish a SQL Project to a database (SQL server 2008 r2) from Visual Studio 2013, I get a dialog box saying </p>
  
  <pre><code>"Object reference not set to an instance of an object" 
  </code></pre>
  
  <p>and then the publish never finishes (the progress icon keeps spinning). </p>
  
  <p><img src="https://i.stack.imgur.com/5QUE5.png" alt="VS 2013 error message"></p>
  
  <p>When I click in the "Output" tab, I don't see any errors there. It says: </p>
  
  <pre><code>========== Build: 4 succeeded or up-to-date, 0 failed, 0 skipped ==========.
  </code></pre>
  
  <p>When I do a "Schema Compare" from VS 2013 between my project and the production database, I get the same error.</p>
  
  <p>Is there any way to track down how and why VS2013's Data Tools Operations is producing that error?</p>