Fixed incomplete &/or cancelled map downloads writing empty maps to disk, causing reconnecting to break Download the map as a temporary file in the same folder then rename it once complete Additional cleanup on map download failure / cancellation Before: https://files.facepunch.com/raul/1b1611b1/16_16-43-LateGallinule.mp4 After: https://files.facepunch.com/raul/1b1611b1/16_16-52-SwelteringDunnart.mp4