cordova打包出现Cannot read property

1. Cannot read property ‘toLowerCase’ of undefined
   报错位置：//platforms/ios/cordova/lib/list-emulator-build-targets 第54行的device.availability.toLowerCase()
   修改：
   将

if (device.name === deviceType.name.replace(/\-inch/g, ' inch') &&
    device.availability.toLowerCase().indexOf('unavailable') < 0) {
    availAcc.push(device);
 }

改为：

if (device.name === deviceType.name || device.name === deviceType.name.replace(/\-inch/g, ' inch')) {
     // Check new flag isAvailable (XCode 10.1+) or legacy string availability (XCode 10 and lower)
     if (device.isAvailable || (device.availability && device.availability.toLowerCase().indexOf('unavailable') < 0)) {
          availAcc.push(device);
      }
  }