FIX bug in base-floodlight/Dockerfile (no patches)
FIX bug in base-floodlight/Dockerfile (no patches)

Previously, if the user had no patches, the docker build would fail.
This fix adds an "|| echo " so that the command still works.

telstra/open-kilda,jonvestal/open-kilda,carmine/open-kilda,nikitamarchenko/open-kilda,jonvestal/open-kilda,telstra/open-kilda,nikitamarchenko/open-kilda,telstra/open-kilda,nikitamarchenko/open-kilda,telstra/open-kilda,nikitamarchenko/open-kilda,telstra/open-kilda,carmine/open-kilda,jonvestal/open-kilda,telstra/open-kilda,carmine/open-kilda,nikitamarchenko/open-kilda,carmine/open-kilda,jonvestal/open-kilda,carmine/open-kilda,nikitamarchenko/open-kilda,telstra/open-kilda,jonvestal/open-kilda,carmine/open-kilda