fix #8056 - more refinements to checking data

[g.raphael] / g.raphael.json

{
    "title": "g.Raphaël",
    "output": "../g.raphael/docs/reference.html",
    "scripts": ["../raphael-min.js", "../g.raphael.js", "reference.js"],
    "files": [{
        "url": "../g.raphael/g.raphael.js",
        "link": "https://github.com/DmitryBaranovskiy/g.raphael/blob/master/g.raphael.js"
    }]
}