Make default onFatalError callback console.error more defensive
Make default onFatalError callback console.error more defensive

getsentry/raven-js,getsentry/raven-js,getsentry/raven-js,miguelb/raven-node,BuildingConnected/raven-node,getsentry/raven-js,getsentry/raven-node,getsentry/raven-node,miguelb/raven-node