CBF dataset and Vector Dataset ValueError

[nilsleh]

I was looking at the cbf dataset, specifically just using the British Columbia data and encountered ValueError: No valid geometry objects found for rasterize. Looking at the VectorDataset class, this occurs when the shapes list is empty, meaning that the query finds a hit for a file, but there are no geometries that survive the filtering based on the query, and then
masks = rasterio.features.rasterize( shapes, out_shape=(int(height), int(width)), transform=transform )
fails.

[adamjstewart]

Not entirely sure what to do about this. I guess we could check to see if shapes is empty and return a Tensor of all "nodata" pixel values in this case? Is that a reliable way to determine the background value?