Update backers September 2020

docs/backers.html

@@ -34,6 +34,7 @@ breadcrumb:
   </tbody>
 </table>
 
+{% if site.data.backers["500"].size > 0 or site.data.github["500"].size > 0 %}
 <h2 class="title is-5">
   Documentation sponsors ($500+)
 </h2>
@@ -49,6 +50,7 @@ breadcrumb:
     {% endfor %}
   </tbody>
 </table>
+{% endif %}
 
 <h2 class="title is-5">
   Homepage sponsors ($100+)