Make links more consistent.

app/templates/links.html

@@ -19,9 +19,13 @@
     <div class="links-flex">
         <div class="backlinks">
             <span class="backlinks-header">← back</span><br />
+        {% if backlinks %}
             {% for link in backlinks %}
             <a href="/node/{{link}}">{{link}}</a><br />
             {% endfor %}
+        {% else %}
+            (none)
+        {% endif %}
         <br />
         </div>
 
@@ -60,9 +64,13 @@
 
         <div class="forwardlinks">
         <span class="forwardlinks-header">→ forward</span><br />
+        {% if forwardlinks %}
             {% for link in forwardlinks %}
             <a href="/node/{{link}}">{{link}}</a><br />
             {% endfor %}
+        {% else %}
+            (none)
+        {% endif %}
         <br />
         </div>
     </div>