bug symfony#18457 [WebProfilerBundle] Fixed error from unset twig variable (simonsargeant)

This PR was squashed before being merged into the 2.8 branch (closes symfony#18457).

Discussion
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[WebProfilerBundle] Fixed error from unset twig variable

| Q             | A
| ------------- | ---
| Branch?       | 2.8
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Minor bug, fixes error from twig variable which was removed in 2.8
Here was where it was originally set https://github.com/symfony/symfony/blob/2.7/src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/config.html.twig#L69

Replaced with expected class name

Commits
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3e2c4c9 [WebProfilerBundle] Fixed error from unset twig variable

Author: fabpot

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Collector/config.html.twig

@@ -50,24 +50,24 @@
                 </span>
             </div>
 
-            {% if 'n/a' != collector.appname %}
+            {% if 'n/a' is not same as(collector.appname) %}
                 <div class="sf-toolbar-info-piece">
                     <b>Kernel name</b>
                     <span>{{ collector.appname }}</span>
                 </div>
             {% endif %}
 
-            {% if 'n/a' != collector.env %}
+            {% if 'n/a' is not same as(collector.env) %}
                 <div class="sf-toolbar-info-piece">
                     <b>Environment</b>
                     <span>{{ collector.env }}</span>
                 </div>
             {% endif %}
 
-            {% if 'n/a' != collector.debug %}
+            {% if 'n/a' is not same as(collector.debug) %}
                 <div class="sf-toolbar-info-piece">
                     <b>Debug</b>
-                    <span class="{{ debug_status_class }}">{{ collector.debug ? 'enabled' : 'disabled' }}</span>
+                    <span class="sf-toolbar-status sf-toolbar-status-{{ collector.debug ? 'green' : 'red' }}">{{ collector.debug ? 'enabled' : 'disabled' }}</span>
                 </div>
             {% endif %}
         </div>