oxidized: fix array handling on key
oxidized: fix array handling on key

openstreetmap/chef,tomhughes/openstreetmap-chef,openstreetmap/chef,tomhughes/openstreetmap-chef,openstreetmap/chef,openstreetmap/chef,openstreetmap/chef,openstreetmap/chef,openstreetmap/chef,tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef,openstreetmap/chef,tomhughes/openstreetmap-chef,tomhughes/openstreetmap-chef