Tool generates empty mapper

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Tool generates empty mapper:

```csharp
[AdaptTo("[name]Dto"), GenerateMapper]
public class Author : BaseEntity
{
public int Id { get; set; }
public string Name { get; set; }

public virtual ICollection Books { get; set; }
public virtual ICollection AuthorBooks { get; set; }
}

public abstract class BaseEntity
{
public BaseEntity()
{
CreatedOn = DateTime.Now;
}

public DateTime CreatedOn { get; set; }
public DateTime? UpdatedOn { get; set; }
}

```

No files or tests are named. Start by reproducing the issue with the shown Author and BaseEntity classes, then trace the mapper generation entry point to find why the output is empty. Done means the tool generates the expected mapper for this example.

Written by the indexing model from the issue text.