DRONE_RUNNER_NETWORKS with an unavailable network

[bradrydzewski]

@reevespaul

What I would expect is to see this error propagated to either the runner or the server logs (or both would be even better).

the error is normally visible in the user interface, however, there was a regression in the UI code that is preventing this from surfacing. This regression is known by the Drone team and they plan to have it resolved in the next release.