Fix iterable check

roles/ipsilon/files/templates/openid/consent_form.html

@@ -12,7 +12,7 @@
                     {% for entry in authz_details|dictsort %}
                         <tr>
                             <td>{{ entry[0] }}</td>
-                            {%- if entry[1] | iterable -%}
+                            {%- if entry[1] is iterable and not entry[1] is string -%}
                             <td>{{ entry[1] | join(', ') }}</td>
                             {%- else -%}
                             <td>{{ entry[1] }}</td>