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/ui/ReportPlatformUIImages.java
return getImageRegistry( ).get( symbolicName );
	}
	/**
	 * Returns the image descriptor stored under the given symbolic name. If
	 * there isn't any value associated with the name then <code>null
	 * </code>
	 * is returned.
	 * 
	 * The class also "caches" commonly used images in the image registry. If
	 * you are looking for one of these common images it is recommended you use
	 * the getImage() method instead.
	 */
	public static ImageDescriptor getImageDescriptor( String symbolicName )
	{
		return imageRegistry.getDescriptor( symbolicName );
	}
	/**
	 * Gets the proper icon image for the given model
	 * 
	 * @param model
	 *            the given model
	 * @return Returns the proper icon image for the given model, or null if no
	 *         proper one exists
	 */
	public static Image getImage( Object model )
	{
		Image image = null;
		if ( model instanceof ExtendedItemHandle )
		{
			image = getImage( getIconSymbolName( ( (ExtendedItemHandle) model )