BATCH-1289: Add null-check to CoreNamespaceUtils.rangeArrayEditorAlreadyDefined() for a CustomEditorConfigurer with no customEditors property.

spring-batch-core/src/test/resources/org/springframework/batch/core/configuration/xml/JobParserParentAttributeTests-context.xml

@@ -4,6 +4,9 @@
 	xsi:schemaLocation="http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch-2.0.xsd
 	http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
 
+	<!-- Ensure that no error is thrown from CoreNamespaceUtils due to an empty configurer -->
+    <beans:bean class="org.springframework.beans.factory.config.CustomEditorConfigurer"/>
+    
 	<beans:import resource="common-context.xml" />
 
 	<job id="job1" parent="baseJob">