Bug 35192 Dialog.applyDialogFont should protect itself against null arguments
RC2 Now that many plugins use this method to apply the dialog font to widgets the method should protect itself against null arguments. Normally clients create their widget tree in a method createControl and there are changes that the returned control might be null. Adding a statement Dialog.applyDialogFont (result) with result == null will result in new NPEs.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
}
	/**
	 * Returns the dialog area control.
	 * <p>
	 * Clients may call this framework method, but should not override it.
	 * </p>
	 *
	 * @return the dialog area, or <code>null</code> if
	 *   the dialog area has not been created yet
	 */
	protected Control getDialogArea() {
		return dialogArea;
	}
	/**
	 * Returns the standard dialog image with the given key.
	 * Note that these images are managed by the dialog framework, 
	 * and must not be disposed by another party.
	 *
	 * @param key one of the <code>Dialog.DLG_IMG_* </code> constants
	 * @return the standard dialog image
	 */
	public static Image getImage(String key) {
		return JFaceResources.getImageRegistry().get(key);
	}
	/**
	 * Returns the button created when <code>createButton</code> is called 
	 * with an ID of <code>IDialogConstants.OK_ID</code>.  If <code>createButton</code> 
	 * was never called with this parameter, or if <code>createButton</code> is 
	 * overridden, <code>getOKButton</code> will return <code>null</code>.
	 *