log errors like network in api calling

Eliminated JSON.stringify method for managing response that are not Json

kavenegar.js

@@ -36,7 +36,7 @@ KavenegarApi.prototype.request = function(action, method, params, callback) {
 			} catch (e){
 				console.log('Exception!',e);
 				if(callback){
-					callback([],500,e.message)
+					callback(e.message,500)
 				}
 			}
 		})
@@ -104,4 +104,4 @@ KavenegarApi.prototype.CallMakeTTS = function(data, callback) {
 module.exports.KavenegarApi = function (options) {
 	var obj = new KavenegarApi(options);
 	return obj;
-}
+}