Fix searx themes

    if 'selected_categories' not in kwargs:

        kwargs['selected_categories'] = []

        for arg in request.args:

        for arg in request.form:

            if arg.startswith('category_'):

                c = arg.split('_', 1)[1]

                if c in categories:

            return jsonify({}), 204

        return render('index.html')

    if request.form.get('category') is None:

        category = None

        for name, value in request.form.items():

            if name.startswith('category_'):

                category = name[9:]

                if category in categories and value == "on":

                    break

        if category is not None:

            request.form["category"] = category

    selected_category = request.form.get('category') or 'general'

    first_page = request.form.get('pageno')

    is_general_first_page = selected_category == 'general' and (first_page is None or first_page == u'1')

        results=results_copy,

        q=search_data.query,

        selected_category=selected_category,

        selected_categories=[selected_category],

        pageno=search_data.pageno,

        time_range=search_data.time_range,

        number_of_results=format_decimal(search_data.results_number),