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PVA: Valid adaptive card json prevents publishing to PVA

See original GitHub issue

Repro

Create a non-PVA bot with adaptive card, test that it works.
Create a PVA bot, switch to advanced authoring with composer
Reproduce the adaptive card in PVA bot
Publish

Error

"severity": "Error",
"source": "MoodCheckerDialog.en-us.lg",
"message": "Error occurred when parsing expression 'json({\r\n \"$schema\": \"http://adaptivecards.io/schemas/adaptive-card.json\",\r\n \"version\": \"1.2\",\r\n \"type\": \"AdaptiveCard\",\r\n \"body\": [\r\n {\r\n \"type\": \"Container\",\r\n \"items\": [\r\n {\r\n \"type\": \"ColumnSet\",\r\n \"columns\": [\r\n {\r\n \"type\": \"Column\",\r\n \"width\": \"auto\",\r\n \"items\": [\r\n {\r\n \"type\": \"Image\",\r\n \"url\": \"https://metatour.azurewebsites.net/img/happy.png\",\r\n \"size\": \"small\"\r\n '. missing '}' at '<EOF>'"
}
---

Sample JSON

# SendActivity_kUwtny()
[Activity
    Attachments = ${SendActivity_kUwtny_attachment_fpA8bl()}
]

# SendActivity_kUwtny_attachment_fpA8bl()
> To learn more Adaptive Cards format, read the documentation at
> https://docs.microsoft.com/en-us/adaptive-cards/getting-started/bots
- \```${json({
  "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
  "version": "1.2",
  "type": "AdaptiveCard",
  "body": [
    {
        "type": "Container",
        "items": [
          {
            "type": "ColumnSet",
            "columns": [
              {
                "type": "Column",
                "width": "auto",
                "items": [
                  {
                    "type": "Image",
                    "url": "https://metatour.azurewebsites.net/img/sad.png",
                    "size": "small"
                  }
                ]
              },
              {
                "type": "Column",
                "width": "stretch",
                "items": [
                  {
                    "type": "TextBlock",
                    "text": "I'm sorry to hear that. Feel better soon.",
                    "weight": "bolder",
                    "wrap": true,
                    "BlockElementHeight" : "stretch"
                  }
                ]
              }
            ]
          }
        ]
    }
  ]
})}\```
(backslash inserted for rendering in issue comment)