the image is empty
Image.getPixbuf
gdkpixbuf.pixbuf.Pixbuf getPixbuf()Gets the #GdkPixbuf being displayed by the #GtkImage. The storage type of the image must be [gtk.types.ImageType.Empty] or [gtk.types.ImageType.Pixbuf] (see [gtk.image.Image.getStorageType]). The caller of this function does not own a reference to the returned pixbuf.
Returns
the displayed pixbuf, or null if