=== modified file 'dhis-2/dhis-web/dhis-web-apps/src/main/webapp/dhis-web-event-visualizer/scripts/core.js'
--- dhis-2/dhis-web/dhis-web-apps/src/main/webapp/dhis-web-event-visualizer/scripts/core.js	2015-04-09 07:52:01 +0000
+++ dhis-2/dhis-web/dhis-web-apps/src/main/webapp/dhis-web-event-visualizer/scripts/core.js	2015-04-09 07:58:02 +0000
@@ -1421,7 +1421,7 @@
 				separator = separator || 'space';
 
                 if (!Ext.isNumber(number)) {
-                    return;
+                    return '';
                 }
 
 				if (separator === 'none') {