fix travis ci failed

es6-promise/es6-promise-tests.ts

@@ -38,26 +38,26 @@ promiseStringArr = allResult;
 //race test
 var raceResult = Promise.race(arrayOfPromise);
 promiseString = raceResult;
- 
+
 
 //then test
 var thenWithPromiseResult = promiseString.then(word => Promise.resolve(word.length));
 promiseNumber = thenWithPromiseResult;
 
 var thenWithPromiseResultAndPromiseReject = promiseString.then(word => Promise.resolve(word.length), error => Promise.resolve(10));
-promiseNumber = thenWithPromiseResultAndPromiseReject;	
+promiseNumber = thenWithPromiseResultAndPromiseReject;
 
 var thenWithPromiseResultAndSimpleReject = promiseString.then(word => Promise.resolve(word.length), error => 10);
-promiseNumber = thenWithPromiseResultAndSimpleReject;	
-	
+promiseNumber = thenWithPromiseResultAndSimpleReject;
+
 var thenWithSimpleResult = promiseString.then(word => word.length);
 promiseNumber = thenWithSimpleResult;
 
 var thenWithSimpleResultAndPromiseReject = promiseString.then(word => word.length, error => Promise.resolve(10));
-promiseNumber = thenWithSimpleResultAndPromiseReject;	
+promiseNumber = thenWithSimpleResultAndPromiseReject;
 
 var thenWithSimpleResultAndSimpleReject = promiseString.then(word => word.length, error => 10);
-promiseNumber = thenWithSimpleResultAndSimpleReject;	
+promiseNumber = thenWithSimpleResultAndSimpleReject;
 
 var thenWithUndefinedFullFillAndSimpleReject = promiseString.then(undefined, error => 10);
 promiseNumber = thenWithUndefinedFullFillAndSimpleReject;
@@ -71,13 +71,16 @@ promiseNumber = thenWithNoResultAndNoReject;
 var voidPromise = new Promise<void>(function (resolve) { resolve(); });
 
 //catch test
-var catchWithSimpleResult = promiseString.catch(error => 10);	
+var catchWithSimpleResult = promiseString.catch(error => 10);
 promiseNumber = catchWithSimpleResult;
 
-var catchWithPromiseResult = promiseString.catch(error => Promise.resolve(10));	
+var catchWithPromiseResult = promiseString.catch(error => Promise.resolve(10));
 promiseNumber = catchWithPromiseResult;
 
-promiseString = promiseString.catch<string>(function () { throw new Error('Better error msg'); });
+promiseString = promiseString.catch<string>(function () {
+  throw new Error('Better error msg');
+  return null;
+});
 
 //examples coming from http://www.html5rocks.com/en/tutorials/es6/promises/
 
@@ -87,7 +90,7 @@ function get(url: string) {
         // Do the usual XHR stuff
         var req = new XMLHttpRequest();
         req.open('GET', url);
-    
+
         req.onload = function() {
             // This is called even on 404 etc
             // so check the status
@@ -101,12 +104,12 @@ function get(url: string) {
                 reject(Error(req.statusText));
             }
         };
-    
+
         // Handle network errors
         req.onerror = function() {
             reject(Error("Network Error"));
         };
-    
+
         // Make the request
         req.send();
     });
@@ -119,11 +122,11 @@ function getJSON(url: string) {
 }
 
 function addHtmlToPage(html: string) {
-	
+
 }
 
 function addTextToPage(text: string) {
-	
+
 }
 
 interface Story {