Bug 120216 Group dialog should be showed even dataset is not set.
- Add a table report item - do not set the data set - try creating a new table group. - An error is shown Expected behavior - As part of the template requirements, we dont want UI to do the validation. User should be able to go and define a group, even if the dataset is not defined.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
slotHandle.add( dataItemHandle );
				}
			}
			index = intervalType.getSelectionIndex( );
			inputGroup.setInterval( intervalChoices[index].getName( ) );
			if ( index != 0 )
			{
				inputGroup.setIntervalRange( intervalRange.getSelection( ) );
			}
			if ( inputGroup instanceof TableGroupHandle )
			{
				if ( includeHeader.getSelection( ) != inputGroup.hasHeader( ) )
				{
					if ( includeHeader.getSelection( ) )
					{
						inputGroup.getHeader( ).add( createRow( ) );
					}
					else
					{
						inputGroup.clearContents( GroupHandle.HEADER_SLOT );
					}
				}
				if ( includeFooter.getSelection( ) != inputGroup.hasFooter( ) )
				{
					if ( includeFooter.getSelection( ) )
					{
						inputGroup.getFooter( ).add( createRow( ) );
					}
					else
					{