ECWID-174089 - fix tests

Author: mplain

src/test/kotlin/com/ecwid/apiclient/v3/rule/NonUpdatablePropertyRules.kt

@@ -147,6 +147,7 @@ val nonUpdatablePropertyRules: List<NonUpdatablePropertyRule<*, *>> = listOf(
 	Ignored(FetchedCoupon::updateDate),
 
 	ReadOnly(FetchedCustomer::id),
+	ReadOnly(FetchedCustomer::externalReferenceId),
 	Ignored(FetchedCustomer::registered),
 	Ignored(FetchedCustomer::updated),
 	Ignored(FetchedCustomer::customerGroupName),

src/test/kotlin/com/ecwid/apiclient/v3/rule/nullablepropertyrules/FetchedCustomerRules.kt

@@ -7,6 +7,7 @@ import com.ecwid.apiclient.v3.rule.NullablePropertyRule.AllowNullable
 import com.ecwid.apiclient.v3.rule.NullablePropertyRule.IgnoreNullable
 
 val fetchedCustomerNullablePropertyRules: List<NullablePropertyRule<*, *>> = listOf(
+	AllowNullable(FetchedCustomer::externalReferenceId),
 	IgnoreNullable(FetchedCustomer::acceptMarketing),
 	IgnoreNullable(FetchedCustomer::billingPerson),
 	IgnoreNullable(FetchedCustomer::customerGroupId),