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
else if ( keyText != null && keyChooser.indexOf( keyText ) != -1 )
		{
			exp = DEUtil.getExpression( columnList.get( keyChooser.indexOf( keyText ) ) );
		}
		else
		{
			exp = keyChooser.getText( ).trim( );
		}
		return exp;
	}
	protected void setExpressionButtonImage( Button button )
	{
		String imageName;
		if ( button.isEnabled( ) )
		{
			imageName = IReportGraphicConstants.ICON_ENABLE_EXPRESSION_BUILDERS;
		}
		else
		{
			imageName = IReportGraphicConstants.ICON_DISABLE_EXPRESSION_BUILDERS;
		}
		Image iamge = ReportPlatformUIImages.getImage( imageName );
		GridData gd = new GridData( );
		gd.widthHint = 20;
		gd.heightHint = 20;
		button.setLayoutData( gd );
		button.setImage( iamge );
		button.getImage( ).setBackground( button.getBackground( ) );
	}
}