=== modified file 'dhis-2/dhis-web/dhis-web-api-fred/src/main/java/org/hisp/dhis/web/webapi/v1/utils/ObjectMapperFactoryBean.java'
--- dhis-2/dhis-web/dhis-web-api-fred/src/main/java/org/hisp/dhis/web/webapi/v1/utils/ObjectMapperFactoryBean.java	2012-12-11 10:59:00 +0000
+++ dhis-2/dhis-web/dhis-web-api-fred/src/main/java/org/hisp/dhis/web/webapi/v1/utils/ObjectMapperFactoryBean.java	2012-12-11 10:59:24 +0000
@@ -46,7 +46,7 @@
         ObjectMapper objectMapper = new ObjectMapper();
         objectMapper.configure( JsonGenerator.Feature.ESCAPE_NON_ASCII, true );
         objectMapper.configure( SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false );
-        objectMapper.setSerializationInclusion( JsonSerialize.Inclusion.NON_NULL );
+        objectMapper.setSerializationInclusion( JsonSerialize.Inclusion.NON_EMPTY );
 
         return objectMapper;
     }