[iOS] Does not render card with empty ColumnSet

[an888ha]

{
    "type": "AdaptiveCard",
    "version": "1.0",
    "body": [
             {
             "type": "ColumnSet",
             "columns": [
                         {
                         "type": "Column",
                         "width": "Auto",
                         "items": [
                                   {
                                   "type": "Image",
                                   "size": "medium",
                                   "url": "https://dummyimage.com/20x20/000/fff"
                                   }
                                   ]
                         },
                         {
                         "type": "Column",
                         "width": "Auto",
                         "items": [
                                   {
                                   "type": "TextBlock",
                                   "weight": "bolder",
                                   "text": "Matt's cafe"
                                   },
                                   {
                                   "type": "TextBlock",
                                   "weight": "bolder",
                                   "text": "Lunch served from 11am - 2pm",
                                   "spacing": "none",
                                   "separation": "none"
                                   }
                                   ]
                         }
                         ]
             },
             {
             "type": "ColumnSet",
             "columns": []
             },
             {
             "type": "TextBlock",
             "weight": "bolder",
             "text": "Item name 1",
             "spacing": "medium"
             },
             {
             "type": "TextBlock",
             "text": "Item description 1",
             "wrap": true
             }
             ],
    "actions": [
                {
                "type": "Action.Submit",
                "data": {
                "taskType": "viewMenuTask",
                "msteams": {
                "type": "task/fetch"
                }
                },
                "dataJson": "{\r\n  \"taskType\": \"viewMenuTask\",\r\n  \"msteams\": {\r\n    \"type\": \"task/fetch\"\r\n  }\r\n}",
                "title": "View full menu"
                },
                {
                "type": "Action.OpenUrl",
                "url": "https://www.bing.com/maps",
                "title": "Get directions"
                },
                {
                "type": "Action.OpenUrl",
                "url": "https://www.bing.com/maps",
                "title": "Order now"
                },
                {
                "type": "Action.Submit",
                "title": "Favorite"
                }
                ]
}

[khouzam]

This is not iOS specific. Android, UWP and iOS have the issue.