Merge pull request #1652 from vector-im/rav/fix_karma_olm_warning

Karma: fix warning by ignoring olm

karma.conf.js

@@ -131,6 +131,11 @@ module.exports = function (config) {
                     path.resolve('./test'),
                 ],
             },
+            plugins: [
+                // olm may not be installed, so avoid webpack warnings by
+                // ignoring it.
+                new webpack.IgnorePlugin(/^olm$/),
+            ],
             devtool: 'inline-source-map',
         },
     });