fix: throw on invalid credentials (#167)

Author: yoshi-automation

packages/google-cloud-bigquery-datatransfer/src/v1/data_transfer_service_client.js

@@ -185,6 +185,10 @@ class DataTransferServiceClient {
             function() {
               const args = Array.prototype.slice.call(arguments, 0);
               return stub[methodName].apply(stub, args);
+            },
+          err =>
+            function() {
+              throw err;
             }
         ),
         defaults[methodName],

packages/google-cloud-bigquery-datatransfer/synth.metadata

@@ -1,19 +1,19 @@
 {
-  "updateTime": "2019-02-07T12:08:50.108535Z",
+  "updateTime": "2019-02-13T12:09:21.567787Z",
   "sources": [
     {
       "generator": {
         "name": "artman",
-        "version": "0.16.10",
-        "dockerImage": "googleapis/artman@sha256:0954ba3e40d694e631bb2f39460d502a3d9f3a66d40b7a9a67f4b30012195beb"
+        "version": "0.16.13",
+        "dockerImage": "googleapis/artman@sha256:5fd9aee1d82a00cebf425c8fa431f5457539562f5867ad9c54370f0ec9a7ccaa"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "49b7906ba5f15c1bc52bf5febc3bd0645d29b980",
-        "internalRef": "232773383"
+        "sha": "ca61898878f0926dd9dcc68ba90764f17133efe4",
+        "internalRef": "233680013"
       }
     },
     {