Fix error handling for user sign out. Closes CWA-1698
Fix error handling for user sign out. Closes CWA-1698

iQuarK/client-web-app.js,blinkboxbooks/client-web-app.js,iQuarK/client-web-app.js,iQuarK/client-web-app.js,blinkboxbooks/client-web-app.js,iQuarK/client-web-app.js