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
private Combo pagebreakBeforeCombo;
	private Combo pagebreakInsideCombo;
	/**
	 * Constructor.
	 * 
	 * @param parentShell
	 */
	public GroupDialog( Shell parentShell, String title )
	{
		super( parentShell, title );
		sytleChoicesAll = getAllStyleChoices( );
	}
	private String[] getAllStyleChoices( )
	{
		String[] styles = ChoiceSetFactory.getStyles( );
		styles = filterPreStyles( styles );
		return styles;
	}
	private static String[] filterPreStyles( String items[] )
	{
		List preStyles = DesignEngine.getMetaDataDictionary( )
				.getPredefinedStyles( );
		List preStyleNames = new ArrayList( );
		for ( int i = 0; i < preStyles.size( ); i++ )
		{
			preStyleNames.add( ( (PredefinedStyle) preStyles.get( i ) ).getName( ) );
		}
		List sytleNames = new ArrayList( );
		for ( int i = 0; i < items.length; i++ )
		{