fixed QT based image loading

src/ACGL/OpenGL/Data/TextureDataLoadStore.cc

@@ -188,7 +188,7 @@ SharedTextureData loadTextureDataFromLodepng(const std::string &_filename)
 //! loads from the QT library
 SharedTextureData loadTextureDataFromQT(const std::string &_filename)
 {
-    SharedTextureData data;
+    SharedTextureData data = SharedTextureData( new TextureData() );
 
     QImage image = QImage( QString(_filename.c_str()) );