better fix

src/core/UBPersistenceManager.cpp

@@ -587,13 +587,8 @@ UBGraphicsScene* UBPersistenceManager::loadDocumentScene(UBDocumentProxy* proxy,
         return mSceneCache.value(proxy, sceneIndex);
     else {
         UBGraphicsScene* scene = UBSvgSubsetAdaptor::loadScene(proxy, sceneIndex);
-        // claudio: this is not a good fix but this code has to be reworked
         if(!scene && UBSettings::settings()->teacherGuidePageZeroActivated->get().toBool()){
-            QString fileName = proxy->persistencePath() + UBFileSystemUtils::digitFileFormat("/page%1.svg", 0);
-            QFile file(fileName);
-            if(!file.exists()){
-                UBPersistenceManager::persistenceManager()->persistDocumentScene(proxy,new UBGraphicsScene(proxy),0);
-            }
+            createDocumentSceneAt(proxy,0);
             scene = UBSvgSubsetAdaptor::loadScene(proxy, 0);
         }