silent the current template error, just to allow typo3 to handle it

ot_templating/Classes/Page/OtPageRepository.php

@@ -94,7 +94,8 @@ class OtPageRepository extends PageRepository
     public function getCurrentTemplate() {
         $rootPageUid = $this->getCurrentSiteRootPageId();
         if (!($rootPageUid >= 0)) {
-            throw new \RuntimeException('Can not find any root page');
+//            throw new \RuntimeException('Can not find any root page');
+            return self::defaultTemplate;
         }
 
         $rootPage = $this->getPage($rootPageUid);