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
* 
	 * @param parent
	 *            the parent composite
	 */
	private void createFilterSortingArea( Composite parent )
	{
		Group group = new Group( parent, SWT.NONE );
		group.setText( GROUP_DLG_GROUP_FILTER_SORTING );
		group.setLayout( new GridLayout( ) );
		group.setLayoutData( new GridData( 550, 250 ) );
		ArrayList list = new ArrayList( 1 );
		list.add( inputGroup );
		TabFolder tab = new TabFolder( group, SWT.TOP );
		tab.setLayoutData( new GridData( GridData.FILL_BOTH ) );
		
		/*
		 * TabItem bindingItem = new TabItem( tab, SWT.NONE ); FormPage
		 * bindingPage = new DataSetColumnBindingsFormPage( tab, new
		 * DataSetColumnBindingsFormHandleProvider( ) ); bindingPage.setInput(
		 * list ); bindingItem.setText( TAB_BINDING ); bindingItem.setControl(
		 * bindingPage );
		 */
		TabItem filterItem = new TabItem( tab, SWT.NONE );
		FormPage filterPage = new FormPage( tab,
				FormPage.FULL_FUNCTION_HORIZONTAL,
				new FilterHandleProvider( ) {
					public int[] getColumnWidths( )
					{
						return new int[]{
								200, 100, 100, 100