=== modified file 'dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/DataQueryParams.java'
--- dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/DataQueryParams.java	2013-05-28 10:45:55 +0000
+++ dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/DataQueryParams.java	2013-05-28 11:35:56 +0000
@@ -753,7 +753,7 @@
         
         if ( param.split( DIMENSION_NAME_SEP ).length > 1 )
         {
-            return Arrays.asList( param.split( DIMENSION_NAME_SEP )[1].split( OPTION_SEP ) );
+            return new ArrayList<String>( Arrays.asList( param.split( DIMENSION_NAME_SEP )[1].split( OPTION_SEP ) ) );
         }
         
         return new ArrayList<String>();
@@ -812,7 +812,7 @@
             return null;
         }
         
-        return Arrays.asList( param.split( OPTION_SEP ) );
+        return new ArrayList<String>( Arrays.asList( param.split( OPTION_SEP ) ) );
     }
     
     /**

=== modified file 'dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/data/DefaultAnalyticsService.java'
--- dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/data/DefaultAnalyticsService.java	2013-05-28 11:04:17 +0000
+++ dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/data/DefaultAnalyticsService.java	2013-05-28 11:35:56 +0000
@@ -386,6 +386,9 @@
             return getAggregatedDataValues( params );
         }
         
+        ListUtils.removeEmptys( columns );
+        ListUtils.removeEmptys( rows );
+        
         queryPlanner.validateTableLayout( params, columns, rows );
         
         Map<String, Double> valueMap = getAggregatedDataValueMapping( params );

=== modified file 'dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/data/DefaultQueryPlanner.java'
--- dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/data/DefaultQueryPlanner.java	2013-05-28 11:14:16 +0000
+++ dhis-2/dhis-services/dhis-service-analytics/src/main/java/org/hisp/dhis/analytics/data/DefaultQueryPlanner.java	2013-05-28 11:35:56 +0000
@@ -33,26 +33,30 @@
 import static org.hisp.dhis.analytics.AggregationType.SUM;
 import static org.hisp.dhis.analytics.DataQueryParams.LEVEL_PREFIX;
 import static org.hisp.dhis.analytics.DataQueryParams.MAX_DIM_OPT_PERM;
+import static org.hisp.dhis.common.DimensionalObject.CATEGORYOPTIONCOMBO_DIM_ID;
+import static org.hisp.dhis.common.DimensionalObject.DATAELEMENT_DIM_ID;
+import static org.hisp.dhis.common.DimensionalObject.DATASET_DIM_ID;
+import static org.hisp.dhis.common.DimensionalObject.INDICATOR_DIM_ID;
+import static org.hisp.dhis.common.DimensionalObject.ORGUNIT_DIM_ID;
+import static org.hisp.dhis.common.DimensionalObject.PERIOD_DIM_ID;
 import static org.hisp.dhis.dataelement.DataElement.AGGREGATION_OPERATOR_AVERAGE;
 import static org.hisp.dhis.dataelement.DataElement.AGGREGATION_OPERATOR_SUM;
 import static org.hisp.dhis.dataelement.DataElement.VALUE_TYPE_BOOL;
-import static org.hisp.dhis.common.DimensionalObject.*;
 
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
 
-import org.apache.commons.lang.StringUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.hisp.dhis.analytics.AggregationType;
 import org.hisp.dhis.analytics.DataQueryGroups;
 import org.hisp.dhis.analytics.DataQueryParams;
-import org.hisp.dhis.common.DimensionType;
 import org.hisp.dhis.analytics.IllegalQueryException;
 import org.hisp.dhis.analytics.QueryPlanner;
 import org.hisp.dhis.analytics.table.PartitionUtils;
 import org.hisp.dhis.common.BaseDimensionalObject;
+import org.hisp.dhis.common.DimensionType;
 import org.hisp.dhis.common.DimensionalObject;
 import org.hisp.dhis.common.ListMap;
 import org.hisp.dhis.common.NameableObject;
@@ -154,7 +158,7 @@
         {
             for ( String column : columns )
             {
-                if ( !StringUtils.isEmpty( column ) && !params.hasDimensionCollapseDx( column ) )
+                if ( !params.hasDimensionCollapseDx( column ) )
                 {
                     violation = "Column must be present as dimension in query: " + column;
                 }
@@ -165,7 +169,7 @@
         {
             for ( String row : rows )
             {
-                if ( !StringUtils.isEmpty( row ) && !params.hasDimensionCollapseDx( row ) )
+                if ( !params.hasDimensionCollapseDx( row ) )
                 {
                     violation = "Row must be present as dimension in query: " + row;
                 }

=== modified file 'dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/ListUtils.java'
--- dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/ListUtils.java	2013-05-27 19:21:48 +0000
+++ dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/util/ListUtils.java	2013-05-28 11:35:56 +0000
@@ -33,9 +33,12 @@
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Set;
 
+import org.apache.commons.lang.StringUtils;
+
 /**
  * @author Lars Helge Overland
  */
@@ -166,4 +169,25 @@
         
         return list;
     }
+    
+    /**
+     * Removes empty strings from the given list. Empty includes null.
+     * 
+     * @param list the list of strings.
+     */
+    public static void removeEmptys( List<String> list )
+    {
+        if ( list != null && !list.isEmpty() )
+        {
+            Iterator<String> iterator = list.iterator();
+            
+            while ( iterator.hasNext() )
+            {
+                if ( StringUtils.isEmpty( iterator.next() ) )
+                {
+                    iterator.remove();
+                }
+            }
+        }
+    }
 }