minor #20397 Tweaked the new firewall config in the security profiler…

… panel (javiereguiluz)

This PR was merged into the 3.2-dev branch.

Discussion
----------

Tweaked the new firewall config in the security profiler panel

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

All these options can be `null` ... so maybe we should take care of that edge case.

### Before

![before](https://cloud.githubusercontent.com/assets/73419/19962832/cfc1a1ca-a1b9-11e6-852c-4c7e4065eb37.png)

### After

![after](https://cloud.githubusercontent.com/assets/73419/19962835/d2bd113e-a1b9-11e6-92ae-f93d4592473c.png)

Commits
-------

cdbbd9d Tweaked the new firewall config in the security profiler panel

src/Symfony/Bundle/SecurityBundle/Resources/views/Collector/security.html.twig

@@ -145,6 +145,7 @@
                     <span class="label">Allows anonymous</span>
                 </div>
             </div>
+
             {% if collector.firewall.security_enabled %}
                 <table>
                     <thead>
@@ -156,38 +157,38 @@
                     <tbody>
                         <tr>
                             <th>provider</th>
-                            <td>{{ collector.firewall.provider }}</td>
+                            <td>{{ collector.firewall.provider ?: '(none)' }}</td>
                         </tr>
                         <tr>
                             <th>context</th>
-                            <td>{{ collector.firewall.context }}</td>
+                            <td>{{ collector.firewall.context ?: '(none)' }}</td>
                         </tr>
                         <tr>
                             <th>entry_point</th>
-                            <td>{{ collector.firewall.entry_point }}</td>
+                            <td>{{ collector.firewall.entry_point ?: '(none)' }}</td>
                         </tr>
                         <tr>
                             <th>user_checker</th>
-                            <td>{{ collector.firewall.user_checker }}</td>
+                            <td>{{ collector.firewall.user_checker ?: '(none)' }}</td>
                         </tr>
                         <tr>
                             <th>access_denied_handler</th>
-                            <td>{{ collector.firewall.access_denied_handler }}</td>
+                            <td>{{ collector.firewall.access_denied_handler ?: '(none)' }}</td>
                         </tr>
                         <tr>
                             <th>access_denied_url</th>
-                            <td>{{ collector.firewall.access_denied_url }}</td>
+                            <td>{{ collector.firewall.access_denied_url ?: '(none)' }}</td>
                         </tr>
                         <tr>
                             <th>listeners</th>
-                            <td>{{ collector.firewall.listeners is empty ? 'none' : profiler_dump(collector.firewall.listeners, maxDepth=1) }}</td>
+                            <td>{{ collector.firewall.listeners is empty ? '(none)' : profiler_dump(collector.firewall.listeners, maxDepth=1) }}</td>
                         </tr>
                     </tbody>
                 </table>
             {% endif %}
         {% elseif collector.enabled %}
             <div class="empty">
-                <p>There is no firewall.</p>
+                <p>This request was not covered by any firewall.</p>
             </div>
         {% endif %}
     {% else %}