Fix SqlServerCe for nhibernate#3314

Author: bahusoid

src/NHibernate.Test/NHSpecificTest/GH3288/Entity.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 
 namespace NHibernate.Test.NHSpecificTest.GH3288
 {
@@ -10,6 +11,7 @@ class TopEntity
 	class MiddleEntity
 	{
 		public virtual int Id { get; set; }
+		public virtual string Name { get; set; }
 		public virtual ISet<Component> Components { get; set; } = new HashSet<Component>();
 	}
 

src/NHibernate.Test/NHSpecificTest/GH3288/Mappings.hbm.xml

@@ -13,6 +13,7 @@
   <id name="Id" >
     <generator class="identity" />
   </id>
+  <property name="Name" />
   <set cascade="all" name="Components" table="BottomEntity">
     <key not-null="true">
       <column name="MiddleEntity_id" />