fix addons_add to capture heroku-api errors instead of restclient when retrieving releases fails closes #499
fix addons_add to capture heroku-api errors instead of restclient when retrieving releases fails
closes #499

rkh/heroku,greeca0204/heroku,duypq94/heroku,gregburek/heroku,Faisalawanisee/heroku,rkh/heroku,uhoh-itsmaciek/heroku,rkh/heroku,dickeyxxx/heroku,heroku/heroku,vcgato29/heroku,sancopanco/heroku,sancopanco/heroku,Faisalawanisee/heroku,sancopanco/heroku,dickeyxxx/heroku,gregburek/heroku,duypq94/heroku,vcgato29/heroku,dickeyxxx/heroku,heroku/heroku,vcgato29/heroku,uhoh-itsmaciek/heroku,duypq94/heroku,heroku/heroku,macedo/heroku,Faisalawanisee/heroku,macedo/heroku,greeca0204/heroku,gregburek/heroku,macedo/heroku,greeca0204/heroku