NPE when rendering a page when a parser fails to parse some content

    @Override
    public XDOM getXDOM()
    {
        if (this.xdomCache == null) {
            try {
                this.xdomCache = parseContent(getContent());
            } catch (XWikiException e) {
                if (StringUtils.isEmpty(getContent())) {
                    LOGGER.debug("Syntax [{}] cannot handle empty input. Returning empty XDOM.", getSyntax());
                    return new XDOM(Collections.<Block>emptyList());
                }
                LOGGER.error("Failed to parse document content to XDOM", e);
            }
        }

        return this.xdomCache.clone();
    }