Let GDAL judge the existence of files

[nathanhilbert]

I'm trying to read HDF4 files in as seen here, but although the subsets are read as files, they cannot be resolved with the file existence check. What do you guys think about just returning the path if it is a file without checking if the file exists and letting gdal raise the error if it can't understand the path?

[aman-thakral]

That seems reasonable. If the path is not found, gdal will return None for a dataset. Can use that to throw an IOError and inform the user that the path does not exist.