Minor shuffle version handling

Author: lightvector

python/shuffle.py

@@ -366,6 +366,8 @@ def get_numpy_npz_headers(filename):
                     header = np.lib.format.read_array_header_1_0(npyfile)
                 elif version == (2, 0):
                     header = np.lib.format.read_array_header_2_0(npyfile)
+                else:
+                    raise NotImplementedError(f"Unexpected np version for {filename}: {version}")
                 (shape, is_fortran, dtype) = header
                 npzheaders[subfilename] = (shape, is_fortran, dtype)
         if wasbad: