Logging out when logged out of Ground Truth causes crash

[petschekr]

Should catch and warn user instead (or silently ignore?)

Full stacktrace:

Error: Invalid JSON: Unauthorized
    at Request._callback (/usr/src/registration/server/routes/strategies.js:39:32)
    at Request.self.callback (/usr/src/registration/node_modules/request/request.js:185:22)
    at Request.emit (events.js:209:13)
    at Request.EventEmitter.emit (domain.js:476:20)
    at Request.<anonymous> (/usr/src/registration/node_modules/request/request.js:1161:10)
    at Request.emit (events.js:209:13)
    at Request.EventEmitter.emit (domain.js:476:20)
    at IncomingMessage.<anonymous> (/usr/src/registration/node_modules/request/request.js:1083:12)
    at Object.onceWrapper (events.js:298:28)
    at IncomingMessage.emit (events.js:214:15)
    at IncomingMessage.EventEmitter.emit (domain.js:476:20)
    at endReadableNT (_stream_readable.js:1178:12)
    at processTicksAndRejections (internal/process/task_queues.js:80:21)