fix: Say when no IRSG ballots exist (ietf-tools#4788)

Fixes ietf-tools#4749

Author: larseggert

ietf/templates/doc/irsg_ballot_status.html

@@ -10,24 +10,28 @@
 {% block content %}
     {% origin %}
     <h1>IRSG ballot status</h1>
-    <table class="table table-sm table-striped tablesorter">
-        <thead>
-            <tr>
-                <th scope="col" data-sort="doc">Document</th>
-                <th scope="col" data-sort="status">Status</th>
-            </tr>
-        </thead>
-        {% if docs %}
-            <tbody>
-                {% for doc in docs %}
-                    <tr>
-                        <td>{{ doc.displayname_with_link }}</td>
-                        {% include "doc/search/status_columns.html" %}
-                    </tr>
-                {% endfor %}
-            </tbody>
-        {% endif %}
-    </table>
+    {% if docs %}
+        <table class="table table-sm table-striped tablesorter">
+            <thead>
+                <tr>
+                    <th scope="col" data-sort="doc">Document</th>
+                    <th scope="col" data-sort="status">Status</th>
+                </tr>
+            </thead>
+                <tbody>
+                    {% for doc in docs %}
+                        <tr>
+                            <td>{{ doc.displayname_with_link }}</td>
+                            {% include "doc/search/status_columns.html" %}
+                        </tr>
+                    {% endfor %}
+                </tbody>
+        </table>
+    {% else %}
+        <p class="alert alert-info my-3">
+            No open IRSG ballots.
+        </p>
+    {% endif %}
 {% endblock %}
 {% block js %}
     <script src="{% static "ietf/js/list.js" %}"></script>