title: No results after extending OrganizationUnits
body: <p>I've extended abp entity (OrganizationUnit), but after that I didn't get any results from "GetAllListAsync()". </p>
  
  <p>My (new) extended class:</p>
  
  <pre><code>public class OrgUnit : OrganizationUnit
  {
      [StringLength(64)]
      [MaxLength(64)]
      public virtual string KeyName { get; set; }
  }
  </code></pre>
  
  <p>I've also added this line in my "DbContext"</p>
  
  <pre><code>{
      ...
      public virtual DbSet&lt;OrgUnit&gt; OrgUnits { get; set; }
  }
  </code></pre>
  
  <p>DbMigration script:</p>
  
  <pre><code>AddColumn("dbo.AbpOrganizationUnits", "KeyName", c =&gt; c.String(maxLength: 64));
  </code></pre>
  
  <p>And then, when I trying to get the OrganizationUnits: Count=0!</p>
  
  <pre><code>var organizationUnits = await _organizationUnitRepository.GetAllListAsync();
  </code></pre>
  
  <p>ABP version: 3.9.0 </p>
  
  <p>Before that change I've used to get 20 items.</p>