[App] Empty image in class

[danlg]

{
    "_id" : "cbYfhZ7fdC4QY8Rsw",
    "group" : "FsEr65o7M3h2PAczM",
    "author" : "FQuy5RY6mmebPoxtP",
    "type" : "text",
    "data" : {
        "content" : ""
    },
    "hidden" : false,
    "createdAt" : ISODate("2016-09-13T10:04:17.109Z"),
    "addons" : [ 
        {
            "type" : "images",
            "fileId" : "**zXjHQFNFiGRh5A3MZ**"
        }, 
        {
            "type" : "comment",
            "comments" : [ 
                {
                    "comment" : "Empty",
                    "createdBy" : "eNufYhf4Hs3eJvyBQ",
                    "createdAt" : ISODate("2016-09-13T10:08:47.715Z"),
                    "isShown" : true
                }, 
                {
                    "comment" : "Hi Roshan. Pictures which you post here dont show up..it's a shame we really want to see them. Also, previous pictures which you have already posted and did show , have now disappeared",
                    "createdBy" : "W5azLuSCeDFZhCvKq",
                    "createdAt" : ISODate("2016-09-13T10:12:28.177Z"),
                    "isShown" : true
                }, 
                {
                    "comment" : "They have not disappeared - you need to use the button on the top of the feed and then you will see all pics.",
                    "createdBy" : "kyEd26oL4WQJBYroS",
                    "createdAt" : ISODate("2016-09-13T10:13:43.847Z"),
                    "isShown" : true
                }
            ],
            "allowComment" : true
        }
    ],
    "versions" : []
}

DOC OK below

{
    "_id" : "4vKu7Tz2mxk9ABsmA",
    "group" : "FsEr65o7M3h2PAczM",
    "author" : "FQuy5RY6mmebPoxtP",
    "type" : "text",
    "data" : {
        "content" : "Tents are going up 😎"
    },
    "hidden" : false,
    "createdAt" : ISODate("2016-09-13T03:04:36.232Z"),
    "addons" : [ 
        {
            "type" : "images",
            "fileId" : "**H3WvN64sYRfCW5rqi**"
        }, 
        {
            "type" : "comment",
            "comments" : [ 
                {
                    "comment" : "Dont hide Yas. I want to see you front and center ;)",
                    "createdBy" : "3kNH6dGcWrggWTW37",
                    "createdAt" : ISODate("2016-09-13T03:21:36.620Z"),
                    "isShown" : true
                }
            ],
            "allowComment" : true
        }
    ],
    "versions" : []
}