change error handling
change error handling

nseckinoral/node-steam-tradeoffers,FelikZ/node-steam-tradeoffer-manager,LorienMan/node-steam-tradeoffers,Alex7Kom/node-steam-tradeoffers,vejbuch/node-steam-tradeoffers,GoeGaming/node-steam-tradeoffers,lpinca/node-steam-tradeoffers