Summary: By qualifying the key with `isEmpty` it prevents overwriting a value specified on the commandline.
Reviewers: rwinklmeier
Reviewed By: rwinklmeier
Subscribers: jenkins
Tags: #swift_pilot_client
Differential Revision: https://dev.swift-project.org/D51
The hardened vatlib requires to use server type VATSIM (which configures
the VATSIM protocol in vatlib) to connect to VATSIM servers. Using
any other server type will from now on fail to connect to VATSIM.
Since unit tests regularly run tests against the server running on VATGER, this has to be enabled
change the default server type to VATSIM by enabling SwiftVatsimSupport.