741  /**
742  * Find the closest physical theme among ancestors and a theme itself
743  *
744  * @param MagentoFrameworkViewDesignThemeInterface $theme
745  * @return MagentoThemeModelTheme
746  * @throws MagentoFrameworkExceptionLocalizedException
747  */
748  protected function _getPhysicalTheme(MagentoFrameworkViewDesignThemeInterface $theme)
749   {
750       $result = $theme;
751     while ($result->getId() && !$result->isPhysical()) {
752           $result = $result->getParentTheme();
753       }
754       if (!$result) {
755           throw new MagentoFrameworkExceptionLocalizedException(
756               new MagentoFrameworkPhrase(
757                'Unable to find a physical ancestor for a theme '%1'.',
758                   [$theme->getThemeTitle()]
759               )
760           );
761       }
762       return $result;
763   }