Investigate: clicking on hero card throw 'displayText' of undefined error

[compulim]

This one need investigations to see if the hero card payload is valid or not.

Version

4.6.0-es5

Describe the bug

When clicked on the following hero card, it does not invoke the expected submit.

{
  attachments: [
    {
      contentType: "application/vnd.microsoft.card.hero",
      content: { buttons: [{ type: "postBack", title: "LET'S GET STARTED" }] },
      buttons: [{ type: "postBack", title: "LET'S GET STARTED" }]
    }
  ];
}

Then send another hero card,

{
  "attachments": [
    {
      "contentType": "application/vnd.microsoft.card.hero",
      "content": {
        "buttons": [
          {
            "type": "openUrl",
            "title": "LOG IN",
            "value": "https://login.microsoftonline.com/microsoft.onmicrosoft.com/oauth2/authorize?client_id="
          }
        ]
      }
    }
  ]
}

Click on it will say, 'displayText' of undefined error.

Steps to reproduce

1. Bot to send the hero card payload as above
2. Click on the button
3. Expect postback to the bot, but not happened
4. Bot to send the second hero card payload
5. Click on the button

Expected behavior

The first one should send a postBack to the bot.

The second one should not error out.

Additional context

[Bug]

[compulim]

Repro the first case on 4.8.0.

Cannot repro the second case, 'displayText' of undefined error.

[compulim]

https://github.com/microsoft/botframework-sdk/blob/master/specs/botframework-activity/botframework-activity.md#post-back did not specify if both text and value are not specified, it should send or not send the post back.

But if we are following the same concept of message back, we should. https://github.com/microsoft/botframework-sdk/blob/master/specs/botframework-activity/botframework-activity.md#message-back.

• A7358: If text and value are both unspecified, the message SHOULD be sent without content.