Fix display for articles without paths in summary

_layouts/website/summary.html

@@ -3,14 +3,20 @@
         <li class="chapter {% if article.path == file.path and not article.anchor %}active{% endif %}" data-level="{{ article.level }}" {% if article.path %}data-path="{{ article.path|resolveFile }}"{% endif %}>
             {% if article.path %}
                 <a href="{{ article.path|contentURL }}{{ article.anchor }}">
-            {% else %}
+            {% elif article.url %}
                 <a target="_blank" href="{{ article.url }}">
+            {% else %}
+                <span>
             {% endif %}
                     {% if article.level != "0" %}
                         <b>{{ article.level }}.</b>
                     {% endif %}
                     {{ article.title }}
+            {% if article.path  or article.url %}
                 </a>
+            {% else %}
+                </span>
+            {% endif %}
 
             {% if article.articles.length > 0 %}
             <ul class="articles">

src/less/website/summary.less

@@ -72,11 +72,6 @@
                     position: relative;
                 }
 
-                span {
-                    cursor: not-allowed;
-                    .opacity(0.3);
-                }
-
                 &.active > a, a:hover {
                     color: @sidebar-link-hover-color;
                     background: @sidebar-link-hover-background;