Show warning when UnicodeEncodeError is raised

[jiasli]

Show warning when UnicodeEncodeError is raised.

To test, on Windows go to Control Panel > Region > Administrative > Change system local and use English. Do not check Beta: Use Unicode UTF-8 for worldwide language support.

Open PowerShell terminal and run

az group show -n testrg
{
  "id": "/subscriptions/0b1f6471-1bf0-4dda-aec3-cb9272f09590/resourceGroups/testrg",
  "location": "centralus",
  "managedBy": null,
  "name": "testrg",
  "properties": {
    "provisioningState": "Succeeded"
  },
  "tags": {
    "key0303": "测试€£￥テスト안녕𓀀𓀁𒀉𒅤"
  },
  "type": "Microsoft.Resources/resourceGroups"
}

The output is correct, but if the output is redirected, PowerShell uses the system encoding. Thus az will silently remove the value of key0303:

> $t = az group show -n testrg
> $t
{
  "id": "/subscriptions/0b1f6471-1bf0-4dda-aec3-cb9272f09590/resourceGroups/testrg",
  "location": "centralus",
  "managedBy": null,
  "name": "testrg",
  "properties": {
    "provisioningState": "Succeeded"
  },
  "tags": {
    "key0303": ""   // value is removed
  },
  "type": "Microsoft.Resources/resourceGroups"
}

The solution is any of

1. Remove invalid characters under the current locale
2. Use a locale that supports those special characters
3. Check Beta: Use Unicode UTF-8 for worldwide language support

If none of the above solution is adopted, Knack will show a warning:

> $t = az group show -n testrg
Unable to encode the output with cp1252 encoding. Unsupported characters are discarded.**

[jiasli]

@shenmuxiaosen, please let me know if this solves the issue.

[shenmuxiaosen]

@shenmuxiaosen, please let me know if this solves the issue.

Yes, the problem resolved after applying the solution 3.