Appveyor badge shows internal error if there are no builds

Appveyor badge shows internal error if there are no builds: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Glancing at the service file, it queries their JSON API and extracts the build status from the build.status property - however for projects that have no…