title: Scaffold-DbContext doesn't produce models
body: <p>I am trying to run <code>Scaffold-DbContext</code> to generate some models from an old system. I am running the following command:</p>
  
  <p><code>Scaffold-DbContext "Data Source=localhost\SQLEXPRESS;Initial Catalog=MAINT_TRAINING;Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer</code></p>
  
  <p>The problem is that I get <em>absolutely</em> no output... No models, no errors, no confirmations... </p>
  
  <p>The tables in the DB all have primary keys.</p>
  
  <p>Am I doing something wrong?</p>