Bug 175664 [Mac] Unexpected internal exception occurs when invoke expression builder
Description: There are two problems: 1. "fx" button (Click this button to invoke Expression Builder) could not be displayed correctly, nothing displayed in the button. 2. Click on the button, an unexpected internal exception occurs. Version:2.2.0.v20070205 Steps to reproduce: 1.Insert a Data item to the layout. Click "fx" button to invoke the expression builder, although on Mac "fx" button could not display correctly. Error log: Argument cannot be null Plug-in Provider: Eclipse.org Plug-in Name: BIRT Designer UI Plug-in ID: org.eclipse.birt.report.designer.ui Error Code: Error.GUIException.invokedByUnexpectedException Error Message:Argument cannot be null
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
* and return it. 4. If none is accessible, returns null.
	 * 
	 * @return the default project according to current selection.
	 */
	public static IProject getDefaultProject( )
	{
		IWorkbenchWindow benchWindow = PlatformUI.getWorkbench( )
				.getActiveWorkbenchWindow( );
		IWorkbenchPart part = benchWindow.getPartService( ).getActivePart( );
		Object selection = null;
		if ( part instanceof IEditorPart )
		{
			selection = ( (IEditorPart) part ).getEditorInput( );
		}
		else
		{
			ISelection sel = benchWindow.getSelectionService( ).getSelection( );
			if ( ( sel != null ) && ( sel instanceof IStructuredSelection ) )
			{
				selection = ( (IStructuredSelection) sel ).getFirstElement( );
			}
		}
		if ( selection instanceof IAdaptable )
		{
			IResource resource = (IResource) ( (IAdaptable) selection ).getAdapter( IResource.class );
			if ( resource != null
					&& resource.getProject( ) != null
					&& resource.getProject( ).isAccessible( ) )
			{
				return resource.getProject( );