fix promise answer

backend/models/alexa.js

@@ -71,24 +71,33 @@ module.exports = {
             if (this.attributes['LaunchRequestYesNo']) {
               this.attributes['LaunchRequestYesNo'] = false;
             }
-            let answer;
+
+            let answerPromiseProps = {
+              resolve: null,
+              reject: null
+            }
+
+            let answer = new Promise((resolve,reject)=>{
+              answerPromiseProps = {
+                resolve:resolve,
+                reject:reject
+              }
+            });
+            
             switch (intent.answerType){
               case constants.answerType.PREDEFINED:
-                answer = new Promise((resolve,reject)=>{
-                  resolve(intent.answer);
-                });
+                answerPromiseProps.resolve(intent.answer);
                 break;
               case constants.answerType.EXTERNAL_SOURCE_WP_JSON:
                 predefinedSourceHelper.getAnswerFromWP(intent.externalAnswerSource).then(answer=>{
-                  answer = new Promise((resolve,reject)=>{
-                    resolve(answer);
-                  });
+                  answerPromiseProps.resolve(answer);
                 }).catch(error=>{
-                    reject(error);
+                  answerPromiseProps.reject(error);
                 });
                 break;
               case constants.answerType.EXTERNAL_SOURCE_RSS:
                 answer = 'Not implemented yet'
+                answerPromiseProps.resolve(answer);
                 break;
             }