Currently, the Python code returns either FS_UNAVAIL (if these
attributes are None) or the proper dicts. As we don't allow editing of
these attributes, in most cases they will therefore be FS_UNAVAIL on
the client.

The Haskell code however returns missingRuntime, which is FS_NODATA,
so a mismatch (that also incurs a RPC call). Fixing it is easy, and
makes the output consistent.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Helga Velroyen <helgav@google.com>