title: EF add-migration generates empty migration
body: <p>I added into my model a new table:</p>
  
  <pre><code>public DbSet&lt;ReturnedTransactions&gt; ReturnedTransactions { get; set; }
  </code></pre>
  
  <p>And i want my migrations to generate that table for me, so i did:</p>
  
  <pre><code>PM&gt; Add-migration returnedTransactions
  </code></pre>
  
  <p>And it generated</p>
  
  <pre><code>public partial class returnedTransactions : DbMigration
  {
      public override void Up()
      {
      }
  
      public override void Down()
      {
      }
  }
  </code></pre>
  
  <p>How do i force this thing to generate proper code for me?</p>