Remove error handling of list_networks

list_networks() of compute network client is implemented like:
  if name:
      networks = [n for n in body['networks'] if n['label'] == name]
So if the network of the specified name don't exist, the return value
is an empty dict. lib_exc.NotFound never happens.
This patch removes lib_exc.NotFound handling.

Change-Id: I8a48d31b6e9b932729d2156cf08669a1970d0b5b
1 file changed