FluidTYPO3\Fluidpages\Service\ConfigurationService::getPageConfiguration PHP Method

    public function getPageConfiguration($extensionName = null)
    {
        if (null !== $extensionName && true === empty($extensionName)) {
            // Note: a NULL extensionName means "fetch ALL defined collections" whereas
            // an empty value that is not null indicates an incorrect caller. Instead
            // of returning ALL paths here, an empty array is the proper return value.
            // However, dispatch a debug message to inform integrators of the problem.
            $this->message('Template paths have been attempted fetched using an empty value that is NOT NULL in ' . get_class($this) . '. This indicates a potential problem with your TypoScript configuration - a ' . 'value which is expected to be an array may be defined as a string. This error is not fatal but may ' . 'prevent the affected collection (which cannot be identified here) from showing up', GeneralUtility::SYSLOG_SEVERITY_NOTICE);
            return [];
        }
        if (null !== $extensionName) {
            return $this->getViewConfigurationForExtensionName($extensionName);
        }
        $configurations = [];
        $registeredExtensionKeys = Core::getRegisteredProviderExtensionKeys('Page');
        foreach ($registeredExtensionKeys as $registeredExtensionKey) {
            $configurations[$registeredExtensionKey] = $this->getViewConfigurationForExtensionName($registeredExtensionKey);
        }
        return $configurations;
    }

 /**
  * @param array $row
  * @return array
  */
 public function getTemplatePaths(array $row)
 {
     $extensionName = $this->getExtensionKey($row);
     $paths = $this->configurationService->getPageConfiguration($extensionName);
     if (TRUE === is_array($paths) && FALSE === empty($paths)) {
         $paths = PathUtility::translatePath($paths);
         return $paths;
     }
     return parent::getTemplatePaths($row);
 }