Hide code blocks when not needed

Author: jeremystretch

netbox/templates/extras/webhook.html

@@ -137,15 +137,23 @@ <h5 class="card-header">
         Additional Headers
       </h5>
       <div class="card-body">
-        <pre>{{ object.additional_headers }}</pre>
+        {% if object.additional_headers %}
+          <pre>{{ object.additional_headers }}</pre>
+        {% else %}
+          <span class="text-muted">None</span>
+        {% endif %}
       </div>
     </div>
     <div class="card">
       <h5 class="card-header">
         Body Template
       </h5>
       <div class="card-body">
-        <pre>{{ object.body_template }}</pre>
+        {% if object.body_template %}
+          <pre>{{ object.body_template }}</pre>
+        {% else %}
+          <span class="text-muted">None</span>
+        {% endif %}
       </div>
     </div>
     {% plugin_right_page object %}