Function addConditionally

packages/main/test/pages/diffable-html.js:4031–4034

(obj, prop, what, where, recurse)

    }

    function addConditionally(obj, prop, what, where, recurse){
        var tmp = fetch(what, where, recurse);
        if(tmp) obj[prop] = tmp;
    }

    var isValidFeed = function(value){
        return value === "rss" || value === "feed" || value === "rdf:RDF";