Bug 183308 IllegalArgumentException occurs after insert a empty group on a List report item[0001]
Description: IllegalArgumentException occurs after insert a empty group on a List report item[0001] Build number: 2.2.0.v20070419-0945 Steps to reproduce: 1, Insert a list 2, Insert a group on the list, only specify the Group On: "aa" Expected result: No exception Actual result: IllegalArgumentException occurs Error log: java.lang.IllegalArgumentException: Argument cannot be null at org.eclipse.swt.SWT.error(SWT.java:3483) at org.eclipse.swt.SWT.error(SWT.java:3422) at org.eclipse.swt.SWT.error(SWT.java:3393) at org.eclipse.swt.widgets.Widget.error(Widget.java:432) at org.eclipse.swt.widgets.Text.setText(Text.java:1793) at org.eclipse.birt.report.designer.ui.dialogs.GroupDialog$6.focusLost(GroupDialog.java:485) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:136) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:962)
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/GroupDialog.java
if ( keyChooser.getSelectionIndex( ) != -1 )
				{
					tocEditor.setText( DEUtil.getExpression( columnList.get( keyChooser.getSelectionIndex( ) ) ) );
				}
			}
			public void widgetDefaultSelected( SelectionEvent e )
			{
			}
		} );
		keyChooser.addFocusListener( new FocusAdapter( ) {
			public void focusLost( FocusEvent e )
			{
				String key = UIUtil.convertToModelString( keyChooser.getText( ),
						true );
				if ( key != null )
				{
					String tocExp = null;
					if ( keyChooser.indexOf( key ) != -1 )
					{
						tocExp = DEUtil.getExpression( columnList.get( keyChooser.indexOf( key ) ) );
					}
					else
					{
						for ( int i = 0; i < columnList.size( ); i++ )
						{
							if ( key.equals( DEUtil.getExpression( columnList.get( i ) ) ) )
							{
								tocExp = DEUtil.getExpression( columnList.get( i ) );
								break;
							}