Merge pull request #5774 from sebavan/master

travis failure

.travis.yml

@@ -48,6 +48,7 @@ jobs:
     - set -e
     - gulp typescript-all
     - gulp tests-viewer-unit
+    - npm install -g webpack webpack-cli
     - travis_retry gulp tests-viewer-validation-virtualscreen
     - travis_retry gulp tests-viewer-validation-browserstack
 notifications: