Fix NRE when saving Poco with null references

Author: mythz

src/ServiceStack.OrmLite/OrmLiteReadExtensions.cs

@@ -761,12 +761,15 @@ public static void SaveAllReferences<T>(this IDbCommand dbCmd, T instance)
                     var refField = GetRefFieldDef(modelDef, refModelDef, refType);
 
                     var results = (IEnumerable)fieldDef.GetValue(instance);
-                    foreach (var oRef in results)
+                    if (results != null)
                     {
-                        refField.SetValueFn(oRef, pkValue);
-                    }
+                        foreach (var oRef in results)
+                        {
+                            refField.SetValueFn(oRef, pkValue);
+                        }
 
-                    dbCmd.CreateTypedApi(refType).SaveAll(results);
+                        dbCmd.CreateTypedApi(refType).SaveAll(results);
+                    }
                 }
                 else
                 {
@@ -775,9 +778,11 @@ public static void SaveAllReferences<T>(this IDbCommand dbCmd, T instance)
                     var refField = GetRefFieldDef(modelDef, refModelDef, fieldDef.FieldType);
 
                     var result = fieldDef.GetValue(instance);
-                    refField.SetValueFn(result, pkValue);
-
-                    dbCmd.CreateTypedApi(refType).Save(result);
+                    if (result != null)
+                    {
+                        refField.SetValueFn(result, pkValue);
+                        dbCmd.CreateTypedApi(refType).Save(result);
+                    }
                 }
             }
         }

tests/ServiceStack.OrmLite.Tests/LoadReferencesTests.cs

@@ -325,5 +325,20 @@ public void Can_SaveAllReferences_then_Load_them()
             Assert.That(dbCustomer.PrimaryAddress, Is.Not.Null);
             Assert.That(dbCustomer.Orders.Count, Is.EqualTo(2));
         }
+
+        [Test]
+        public void Can_save_with_null_references()
+        {
+            var customer = new Customer
+            {
+                Name = "Customer 1",
+                PrimaryAddress = null,
+                Orders = null,
+            };
+
+            db.Save(customer, references: true);
+            
+            Assert.That(customer.Id, Is.GreaterThan(0));
+        }
     }
 }