title: Replacing empty strings with nulls with AutoMapper
body: <p>I am using AutoMapper to map DTOs to entities. Also, my WCF services are being consumed by SAP.</p>
  
  <p>The issue is that SAP sends me empty strings instead of nulls (that is, <code>""</code> instead of <code>null</code>).</p>
  
  <p>So I basically need to go through every field of the DTO I am receiving, and replace empty strings by nulls. Is there an easy way to accomplish this with AutoMapper?</p>