Update index.html.jinja

Author: lgc2333

nonebot_plugin_picmenu_next/templates/default/res/index.html.jinja

@@ -18,7 +18,9 @@
   <div class="card flex relative">
     <div class="index"><span class="no">No.</span>{{ loop.index }}</div>
     <h3>{{ it.name }}</h3>
+    {% if it.description -%}
     <div class="md">{{ it.description | layout(it.pmn.markdown) }}</div>
+    {% endif -%}
   </div>
   {% endfor -%}
 </div>