device list is empty

[xiaocong]

TypeError: Cannot read property 'workstation_mac' of undefined at /root/git/remote-task-web-app/lib/api/devices.coffee:17:63, :27:77 at Array.filter (native) at Function..filter..select (/root/git/remote-task-web-app/node_modules/underscore/underscore.js:172:65) at [object Object].Collection.(anonymous function) as filter at /root/git/remote-task-web-app/lib/api/devices.coffee:17:7, :26:56 at Array.forEach (native) at module.exports.list (/root/git/remote-task-web-app/lib/api/devices.coffee:16:22, :25:15) at callbacks (/root/git/remote-task-web-app/node_modules/express/lib/router/index.js:164:37) at authAdmin (/root/git/remote-task-web-app/lib/api/auth.coffee:22:5, :36:14) at callbacks (/root/git/remote-task-web-app/node_modules/express/lib/router/index.js:164:37) at auth (/root/git/remote-task-web-app/lib/api/auth.coffee:16:5, :26:14) at callbacks (/root/git/remote-task-web-app/node_modules/express/lib/router/index.js:164:37) at param (/root/git/remote-task-web-app/node_modules/express/lib/router/index.js:138:11) at pass (/root/git/remote-task-web-app/node_modules/express/lib/router/index.js:145:5) at Router._dispatch (/root/git/remote-task-web-app/node_modules/express/lib/router/index.js:173:5) at Object.router (/root/git/remote-task-web-app/node_modules/express/lib/router/index.js:33:10) at next (/root/git/remote-task-web-app/node_modules/express/node_modules/connect/lib/proto.js:193:15) at Object.app.get.passport.authenticate.failureRedirect [as handle](/root/git/remote-task-web-app/server.coffee:61:3, :87:12) at Context.next (/root/git/remote-task-web-app/node_modules/express/node_modules/connect/lib/proto.js:193:15) at Context.actions.pass (/root/git/remote-task-web-app/node_modules/passport/lib/passport/context/http/actions.js:77:8) at /root/git/remote-task-web-app/node_modules/passport/lib/passport/strategies/session.js:61:12 at pass (/root/git/remote-task-web-app/node_modules/passport/lib/passport/index.js:321:31) at /root/git/remote-task-web-app/node_modules/passport/lib/passport/index.js:332:35 at /root/git/remote-task-web-app/lib/api/auth.coffee:93:7, :154:16 at Object. (/root/git/remote-task-web-app/node_modules/orm/lib/Model.js:112:12) at /root/git/remote-task-web-app/node_modules/orm/lib/Instance.js:25:7 at Array.map (native) at Instance.emitEvent (/root/git/remote-task-web-app/node_modules/orm/lib/Instance.js:24:17) at /root/git/remote-task-web-app/node_modules/orm/lib/Instance.js:652:4 at process._tickCallback (node.js:415:13)