provision/docker/healer: ensure empty config struct values are ignored
provision/docker/healer: ensure empty config struct values are ignored

ArxdSilva/tsuru,ggarnier/tsuru,guilhermebr/tsuru,cezarsa/tsuru,guilhermebr/tsuru,gwmoura/tsuru,tsuru/tsuru,tsuru/tsuru,guilhermebr/tsuru,gwmoura/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,tsuru/tsuru,ggarnier/tsuru,cezarsa/tsuru,gwmoura/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,tsuru/tsuru,ggarnier/tsuru,cezarsa/tsuru,ArxdSilva/tsuru