Bug 122045 Template should show blank preview when there is no image
Create a template but do not associate an image with it. Place the template in the templates directory. Now, create a new report design. On the second page of the New Report dialog, select the template that has no image. Actual result: The preview appears as a white rectangle with a small red square in the top left. Expected result: The preview appears as a gray background in the preview image area.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/wizards/WizardTemplateChoicePage.java
* 
	 * @see org.eclipse.jface.dialogs.IDialogPage#createControl(org.eclipse.swt.widgets.Composite)
	 */
	public void createControl( Composite parent )
	{
		Composite composite = new Composite( parent, SWT.NONE );
		GridLayout gridLayout = new GridLayout( );
		gridLayout.numColumns = 2;
		gridLayout.marginHeight = 10;
		gridLayout.marginWidth = 10;
		gridLayout.horizontalSpacing = 10;
		gridLayout.verticalSpacing = 10;
		composite.setLayout( gridLayout );
		Label label0 = new Label( composite, SWT.NONE );
		label0.setText( MESSAGE_REPORT_TEMPLATES );
		Label previewLabel = new Label( composite, SWT.NONE );
		previewLabel.setText( MESSAGE_PREVIEW );
		GridData data = new GridData( GridData.BEGINNING );
		previewLabel.setLayoutData( data );
		templateList = new List( composite, SWT.BORDER );
		createCustomTemplateList( );
		for ( Iterator it = templates.iterator( ); it.hasNext( ); )
		{
			templateList.add( ( (Template) it.next( ) ).getName( ) );
		}
		data = new GridData( GridData.BEGINNING | GridData.FILL_VERTICAL );
		data.widthHint = 170;
		templateList.setLayoutData( data );
		previewPane = new Composite( composite, 0 );
		data = new GridData( GridData.FILL_HORIZONTAL | GridData.FILL_VERTICAL );