Modified QuerySingle to exclude nulls on it's filter set.

src/ServiceStack.OrmLite/OrmLiteReadExtensions.cs

@@ -288,7 +288,7 @@ public static T QuerySingle<T>(this IDbCommand dbCmd, object anonType)
 		{
 			if (typeof(T).IsValueType) return QueryScalar<T>(dbCmd, anonType);
 
-			dbCmd.SetFilters<T>(anonType);
+			dbCmd.SetFilters<T>(anonType, true);
 
 			using (var dbReader = dbCmd.ExecuteReader())
 				return dbReader.ConvertTo<T>();

tests/ServiceStack.OrmLite.Tests/OrmLiteQueryTests.cs

@@ -115,5 +115,33 @@ public void Can_loop_each_with_filter_from_ModelWithOnlyStringFields_table()
 			}
 		}
 
+        [Test]
+        public void Can_GetSingle_with_filter_from_ModelWithOnlyStringFields_table()
+        {
+            using (var db = ConnectionString.OpenDbConnection())
+            using (var dbCmd = db.CreateCommand())
+            {
+                dbCmd.CreateTable<ModelWithOnlyStringFields>(true);
+
+                var rowIds = new List<string>(new[] { "id-1", "id-2", "id-3" });
+
+                rowIds.ForEach(x => dbCmd.Insert(ModelWithOnlyStringFields.Create(x)));
+
+                var filterRow = ModelWithOnlyStringFields.Create("id-4");
+                filterRow.AlbumName = "FilteredName";
+
+                dbCmd.Insert(filterRow);
+
+                var row = dbCmd.QuerySingle<ModelWithOnlyStringFields>(new { filterRow.AlbumName });
+                Assert.That(row.Id, Is.EqualTo(filterRow.Id));
+
+                row = dbCmd.QuerySingle<ModelWithOnlyStringFields>(new { filterRow.AlbumName, Id = (object)null });
+                Assert.That(row.AlbumName, Is.EqualTo(filterRow.AlbumName));
+
+                row = dbCmd.QuerySingle<ModelWithOnlyStringFields>(new { AlbumName = "Junk", Id = (object)null });
+                Assert.That(row, Is.Null);
+            }
+        }
+
 	}
 }