opserver/Opserver — pull request #47 by yellis (2014-05-15 07:34:27+00:00)
Title: Avoid InvalidOperationException when no traffic

In `GraphController.NetworkJson` if the `GetUtilization` method returns an empty list for `traffic`, an `InvalidOperationException` will be thrown when generating the Json method, due to running `Max` on an empty list. This PR avoids the issue.