img with unreachable src blocks all amp html about amperize HOT 6 OPEN

<img src="http://hillsborough.flvs.net/webdav/assessment_images/educator_econ_v13/06_06A_exam/0606_g8.jpg" alt="A marginal cost analysis graph with x axis Quantity and y axis Price. There are no units on the x or y axis, but assuming 0 to 10 for both axes. The marginal cost curve starts at 0, 4 and slopes down to 4, 2. It then rises from 4, 2 to 10, 10. There is a marginal cost line at extending from 0, 6 to 10, 6. The letters A to D are on the graph at the following locations: A 2, 2, B 6, 4, C 8, 6, D 10, 10.">
<amp-anim src="http://hillsborough.flvs.net/educator/images/spellcheck.gif" alt="" width="96" height="24" layout="fixed"></amp-anim>

    //add div fallback to amp-image in case it has no correct src- but has alt/title
    function addImgFallback(element) {
        Object.assign(element, {
            name: `amp-${element.name}`,
            attribs: {
                width: 5,
                height: 5,
                src: 'blank'
            },
            children: [{
                type: 'tag',
                name: 'div',
                attribs: { fallback: '' },
                children: [{ data: `${element.attribs.alt || element.attribs.title}`, type: 'text' }],
                prev: null,
                next: null,
                parent: element
            }]
        });
        return enter();
    }

    function applyDefaults(element, name) {
        element.name = name;
        element.attribs.width = self.config[name].width;
        element.attribs.height = self.config[name].height;
    }

        if (!validator.isURL(imageObj.href)) {

            if (element.attribs.alt || element.attribs.title)
                return addImgFallback(element);
            else
                return skip();
        }

        // We need the user-agent, otherwise some https request may fail (e. g. cloudfare)
        requestOptions = {
            headers: {
                'User-Agent': 'Mozilla/5.0 Safari/537.36'
            },
            timeout: timeout,
            encoding: null
        };

        return got(
            imageObj.href,
            requestOptions
        ).then(function (response) {
            try {
                // Using the Buffer rather than an URL requires to use sizeOf synchronously.
                // See https://github.com/image-size/image-size#asynchronous
                var dimensions = sizeOf(response.body);

                // CASE: `.ico` files might have multiple images and therefore multiple sizes.
                // We return the largest size found (image-size default is the first size found)
                if (dimensions.images) {
                    dimensions.width = _.maxBy(dimensions.images, function (w) { return w.width; }).width;
                    dimensions.height = _.maxBy(dimensions.images, function (h) { return h.height; }).height;
                }

                element.attribs.width = dimensions.width;
                element.attribs.height = dimensions.height;

                return getLayoutAttribute(element);
            } catch (err) {
                // fix amperize- apply defaults (name & dimensions) to this element
                applyDefaults(element, 'amp-img');
                return enter();
            }
        }).catch(function () {
            // fix amperize- apply defaults (name & dimensions) to this element
            applyDefaults(element, 'amp-img');
            return enter();
        });
    }

    if ((element.name === 'img' || element.name === 'iframe') && !element.attribs.src) {
        if (element.attribs.alt || element.attribs.title)
            return addImgFallback(element);
        else
            return skip();
    }