Removed ability to delete all ids, when only one id is available.

forum/skins/default/templates/auth/auth_settings.html

@@ -9,7 +9,7 @@
     <p class="message">{% blocktrans %}These are the external authentication providers currently associated with your account.{% endblocktrans %}</p>
     <div>
         {% for key in auth_keys %}
-            <p>{{ key.name }} (<a href="{% url user_remove_external_provider id=key.id %}">{% trans "remove" %}</a>)</p>
+            <p>{{ key.name }} {% if auth_keys|length > 1 %} (<a href="{% url user_remove_external_provider id=key.id %}">{% trans "remove" %}</a>) {% endif %}</p>
         {% endfor %}
     </div>
 {% endif %}