Show 4 latest posts when site.related_posts is nil

`site.related_posts` should return an array of latest posts when no related ones are found due to `lsi` being disabled (GitHub Page's doesn't support it).

This works around that bug by showing the 4 latest posts to populate the "You May Also Enjoy" module when enabled with `related: true`.

Fixes #554
Related: #978 #1022

CHANGELOG.md

@@ -11,6 +11,7 @@
 - Improve Chinese `date_label` and `minute_read` translations in `ui-text.yml`. [#1205](https://github.com/mmistakes/minimal-mistakes/pull/1205) [#1211](https://github.com/mmistakes/minimal-mistakes/pull/1211)
 - Add note to Quick-Start Guide about GitHub Pages hosting alternatives that allow 3rd party gem themes and Jekyll plugins.
 - Add note to configuration documentation about Cloudflare minification as an alternative to `layout: compress`. [#1217](https://github.com/mmistakes/minimal-mistakes/pull/1217)
+- Show 4 latest posts in "You May Also Enjoy" module when `related: true` and no related posts are found due to `lsi` ([latent semantic indexing](https://en.wikipedia.org/wiki/Latent_semantic_analysis#Latent_semantic_indexing)) being disabled on GitHub Pages. [#554](https://github.com/mmistakes/minimal-mistakes/issues/554)
 
 ### Bug Fixes
 

_layouts/single.html

@@ -60,7 +60,7 @@ layout: default
     {% endif %}
   </article>
 
-  {% comment %}<!-- only show related on a post page when not disabled -->{% endcomment %}
+  {% comment %}<!-- only show related on a post page when `related: true` -->{% endcomment %}
   {% if page.id and page.related and site.related_posts.size > 0 %}
     <div class="page__related">
       <h4 class="page__related-title">{{ site.data.ui-text[site.locale].related_label | default: "You May Also Enjoy" }}</h4>
@@ -70,5 +70,15 @@ layout: default
         {% endfor %}
       </div>
     </div>
+  {% comment %}<!-- otherwise show recent posts if no related when `related: true` -->{% endcomment %}
+  {% elsif page.id and page.related %}
+    <div class="page__related">
+      <h4 class="page__related-title">{{ site.data.ui-text[site.locale].related_label | default: "You May Also Enjoy" }}</h4>
+      <div class="grid__wrapper">
+        {% for post in site.posts limit:4 %}
+          {% include archive-single.html type="grid" %}
+        {% endfor %}
+      </div>
+    </div>
   {% endif %}
 </div>

docs/_docs/18-history.md

@@ -4,7 +4,7 @@ permalink: /docs/history/
 excerpt: "Change log of enhancements and bug fixes made to the theme."
 sidebar:
   nav: docs
-last_modified_at: 2017-09-05T12:07:50-04:00
+last_modified_at: 2017-09-05T12:58:56-04:00
 ---
 
 ## Unreleased
@@ -20,6 +20,7 @@ last_modified_at: 2017-09-05T12:07:50-04:00
 - Improve Chinese `date_label` and `minute_read` translations in `ui-text.yml`. [#1205](https://github.com/mmistakes/minimal-mistakes/pull/1205) [#1211](https://github.com/mmistakes/minimal-mistakes/pull/1211)
 - Add note to Quick-Start Guide about GitHub Pages hosting alternatives that allow 3rd party gem themes and Jekyll plugins.
 - Add note to configuration documentation about Cloudflare minification as an alternative to `layout: compress`. [#1217](https://github.com/mmistakes/minimal-mistakes/pull/1217)
+- Show 4 latest posts in "You May Also Enjoy" module when `related: true` and no related posts are found due to `lsi` ([latent semantic indexing](https://en.wikipedia.org/wiki/Latent_semantic_analysis#Latent_semantic_indexing)) being disabled on GitHub Pages. [#554](https://github.com/mmistakes/minimal-mistakes/issues/554)
 
 ### Bug Fixes
 

docs/_layouts/single.html

@@ -60,7 +60,7 @@ layout: default
     {% endif %}
   </article>
 
-  {% comment %}<!-- only show related on a post page when not disabled -->{% endcomment %}
+  {% comment %}<!-- only show related on a post page when `related: true` -->{% endcomment %}
   {% if page.id and page.related and site.related_posts.size > 0 %}
     <div class="page__related">
       <h4 class="page__related-title">{{ site.data.ui-text[site.locale].related_label | default: "You May Also Enjoy" }}</h4>
@@ -70,5 +70,15 @@ layout: default
         {% endfor %}
       </div>
     </div>
+  {% comment %}<!-- otherwise show recent posts if no related when `related: true` -->{% endcomment %}
+  {% elsif page.id and page.related %}
+    <div class="page__related">
+      <h4 class="page__related-title">{{ site.data.ui-text[site.locale].related_label | default: "You May Also Enjoy" }}</h4>
+      <div class="grid__wrapper">
+        {% for post in site.posts limit:4 %}
+          {% include archive-single.html type="grid" %}
+        {% endfor %}
+      </div>
+    </div>
   {% endif %}
 </div>