return StringUtil.isBlank(key) ? StringUtil.EMPTY : key;
    }

    public String[] getRelatedQueries(final String query) {
        final String key = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        final Map<String, String[]> map = relatedQueryMap.get(key);
        if (map != null) {
            final String[] queries = map.get(toLowerCase(query));
            if (queries != null) {