./Scripts/bootstrap.sh return KeyError about webdriveragent

[KazuCocoa]

What the result of xcrun simctl list -j devices?

The script runs below line. If the JSON output has no devices, the error occures.

xcrun simctl list -j devices | python -c "import sys,json;print(' '.join(map(lambda x: x[0], filter(lambda x: len([y for y in x[1] if y.get('availability') == '(available)' or y.get('isAvailable')]) > 0, json.load(sys.stdin)['devices'].items()))))"

{
  "devices" : {
    "com.apple.CoreSimulator.SimRuntime.tvOS-13-2" : [
      {
        "state" : "Shutdown",
        "isAvailable" : false,
        "name" : "Apple TV",
        "udid" : "499AD576-52EB-40F1-BA87-0E3C997020D7",
        "availabilityError" : "runtime profile not found"
      },

If your environment has no devices, please share the result of xcrun simctl list -j devices and Xcode version