fixed some build issues

src/adaptors/UBSvgSubsetAdaptor.cpp

@@ -1902,6 +1902,9 @@ void UBSvgSubsetAdaptor::UBSvgSubsetWriter::svgItemToLinkedSvg(UBGraphicsSvgItem
 
     mXmlWriter.writeStartElement("image");
 
+    QString fileName = UBPersistenceManager::imageDirectory + "/" + svgItem->uuid().toString() + ".svg";
+
+
     mXmlWriter.writeAttribute(nsXLink, "href", fileName);
 
     graphicsItemToSvg(svgItem);

src/board/UBBoardController.cpp

@@ -1154,7 +1154,7 @@ UBItem *UBBoardController::downloadFinished(bool pSuccess, QUrl sourceUrl, QUrl
             if (!file.open(QIODevice::WriteOnly))
             {
                 qWarning() << "cannot open file for writing embeded svg content " << path;
-                return;
+                return NULL;
             }
 
             file.write(svgItem->fileData());