small fix to openid message find_ns method
small fix to openid message find_ns method

it foolishly failed in presence of ns field and absence of namespace in
question.

Signed-off-by: Michael Krelin <4dcc4173d80a2817206e196a38f0dbf7850188ff@klever.net>

hacker/libopkele,hacker/libopkele,hacker/libopkele