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
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.internal.ui.dialogs.BaseDialog#initDialog()
	 */
	protected boolean initDialog( )
	{
		if ( inputGroup.getName( ) != null )
		{
			nameEditor.setText( inputGroup.getName( ) );
		}
		columnList = DataSetManager.getCurrentInstance( )
				.getColumns( dataSetList );
		Iterator itor = columnList.iterator( );
		if ( !itor.hasNext( ) )
		{
			ExceptionHandler.openMessageBox( ERROR_DLG_TITLE_NO_DATA,
					ERROR_MESSAGE_NO_DATA,
					SWT.ICON_QUESTION );
			return false;
		}
		while ( itor.hasNext( ) )
		{
			keyChooser.add( ( (DataSetItemModel) itor.next( ) ).getDisplayName( ) );
		}
		String groupKey = inputGroup.getKeyExpr( );
		int index = -1;
		if ( groupKey != null )
		{
			for ( int i = 0; i < columnList.size( ); i++ )