The code intended to not fail when a Port object was missing but to instead skip the handling of that node but instead there is an unhandled exception because the get_by_address() method throws PortNotFound instead of returning None when a port couldn't be found. Change-Id: I04dfa09ada7e6a9d22ba16051cb5737daf3bc668 Signed-off-by: Doug Goldstein <cardoe@cardoe.com>