{% macro bs_filters(filter_title, filter_display, init_str=None) -%}
{% for filter_field, filters in filter_display.items() -%}
{% if filters|length > 0 %}
{%- if init_str is not none %}{{ init_str }}{% set init_str=None %}{%- endif %}
{{ filter_title[filter_field] }}
{% for filter_name in filters %}
{{ filter_name }}
{% endfor %}
{% endif %}
{%- endfor %}
{%- endmacro %}