Fix None exception in decorateResult in BIRD

Fix exception that might be caused in various BIRD commands by None value
in session.getResult() return which might happen when you have fast server
where LG is running on.
Fix None exception in decorateResult in Cisco

Fix exception that might be caused in various Cisco commands by None value
in session.getResult() return which might happen when you have fast server
where LG is running on.