add fallback description

_config.yml

@@ -1,5 +1,6 @@
 ---
 title: Choose a License
+description: A site to provide non-judgmental guidance on choosing a license for your open source project
 relative_permalinks: false
 markdown: kramdown
 url: "http://choosealicense.com"

_includes/seo.html

@@ -7,7 +7,7 @@
     {% if page.description %}
       {% assign seo_description = page.description | strip_html | strip_newlines %}
     {% else %}
-      {% assign seo_description = site.tagline | strip_html | strip_newlines %}
+      {% assign seo_description = site.description | strip_html | strip_newlines %}
     {% endif %}
 
     <!-- le seo -->

index.html

@@ -3,7 +3,6 @@ layout: default
 class: home
 hide_breadcrumbs: true
 title: Choosing an open source license doesn’t need to be scary
-description: A site to provide non-judgmental guidance on choosing a license for your open source project
 permalink: /
 ---