No error or warning is raised when required input files are missing

[luukvdmeer]

For example: When I compute netascore (Docker + OSM workflow) using a weight file that specifies a non-zero weight for gradient_bicycle, but do not provide a DEM, the computation succeeds without giving any error or warning. The same is true for specifying a noise weight without providing a noise file.

How are these situations handled internally? Does it mess up the normalization of the indices? Depending on that, I would at least give a warning but probably better an error.