Bug 151793 [regression]NPE when open attached report and transfer to layout.
Description: NPE when open attached report and transfer to layout. Steps to reproduce: 1. Open attached report 2. Transfer to Layout. Expected result: This report should be able to transfer back to Layout Actual result: A Warning dialog to edit xml source and NPE: java.lang.NullPointerException at org.eclipse.birt.report.designer.internal.ui.util.UIUtil.resetViewSelection(UIUtil.java:913) at org.eclipse.birt.report.designer.ui.editors.pages.ReportLayoutEditorFormPage.onBroughtToTop(ReportLayoutEditorFormPage.java:283) at org.eclipse.birt.report.designer.ui.editors.MultiPageReportEditor.prePageChanges(MultiPageReportEditor.java:611) at org.eclipse.birt.report.designer.ui.editors.MultiPageReportEditor.pageChange(MultiPageReportEditor.java:536) at org.eclipse.ui.part.MultiPageEditorPart$2.widgetSelected(MultiPageEditorPart.java:232) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:90) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:952) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:937) at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:709) at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3171) at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1953) at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:288) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:928) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3348) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2968) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1914) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1878) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:419) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.IDEApplication.run(IDEApplication.java:95) at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:78) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:92) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:68) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:177) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) at org.eclipse.core.launcher.Main.invokeFramework(Main.java:336) at org.eclipse.core.launcher.Main.basicRun(Main.java:280) at org.eclipse.core.launcher.Main.run(Main.java:977) at org.eclipse.core.launcher.Main.main(Main.java:952)
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/ui/editors/pages/ReportLayoutEditorFormPage.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.forms.editor.IFormPage#selectReveal(java.lang.Object)
	 */
	public boolean selectReveal( Object object )
	{
		return false;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IWorkbenchPart#createPartControl(org.eclipse.swt.widgets.Composite)
	 */
	public void createPartControl( Composite parent )
	{
		super.createPartControl( parent );
		Control[] children = parent.getChildren( );
		control = children[children.length - 1];
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.designer.ui.editors.schematic.layout.AbstractReportGraphicalEditorWithRuler#dispose()
	 */
	public void dispose( )
	{
		if ( getCommandStack( ) != null && getCommandStack( ) instanceof WrapperCommandStack)
		{
			WrapperCommandStack stack = (WrapperCommandStack) getCommandStack( );