assign_am: mark with different colors the AMs with no slots

Signed-off-by: Mattia Rizzolo <mattia@debian.org>

process/templates/process/assign_am.html

@@ -63,12 +63,16 @@ document.addEventListener("DOMContentLoaded", evt => { main(); });
         <form action="{% url 'process_assign_am' pk=process.pk %}" method="post">{% csrf_token %}
           <input type="hidden" name="am" value="{{am.lookup_key}}">
           <button
-          {% if am.person.status == "dd_u" and process.applying_for == "dd_nu" %}
-            class="btn btn-sm btn-secondary" data-toggle="tooltip" title="DD_U AMs should be preferably assigned to DD_U processes"
-          {% elif am.person.status == "dd_nu" and process.applying_for == "dd_u" %}
-            class="btn btn-sm btn-danger" data-toggle="tooltip" title="DD_NU AMs should not be assigned to DD_U processes"
+          {% if am.stats_free == 0 %}
+            class="btn btn-sm btn-secondary" data-toggle="tooltip" title="This AM has no free slots"
           {% else %}
-            class="btn btn-sm btn-primary"
+            {% if am.person.status == "dd_u" and process.applying_for == "dd_nu" %}
+              class="btn btn-sm btn-warning" data-toggle="tooltip" title="DD_U AMs should be preferably assigned to DD_U processes"
+            {% elif am.person.status == "dd_nu" and process.applying_for == "dd_u" %}
+              class="btn btn-sm btn-danger" data-toggle="tooltip" title="DD_NU AMs should not be assigned to DD_U processes"
+            {% else %}
+                class="btn btn-sm btn-primary"
+            {% endif %}
           {% endif %}
           type="submit">{% trans "Assign" %}</button>
         </form>