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 ( preStyleNames.indexOf( items[i] ) == -1 )
			{
				sytleNames.add( items[i] );
			}
		}
		return (String[]) ( sytleNames.toArray( new String[]{} ) );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)
	 */
	protected Control createDialogArea( Composite parent )
	{
		
		if ( sytleChoicesAll == null )
		{
			sytleChoicesAll = getAllStyleChoices( );
		}
		Composite topComposite = (Composite) super.createDialogArea( parent );
		createTitleArea( topComposite );
		Composite composite = new Composite( topComposite, SWT.NONE );
		composite.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
		composite.setLayout( new GridLayout( 2, true ) );
		createFieldArea( composite );
		createGroupArea( composite );
		createBookmarkArea( topComposite );
		createTOCArea( topComposite );
		createFilterSortingArea( topComposite );
		UIUtil.bindHelp( parent, IHelpContextIds.GROUP_DIALOG_ID );