[BUGFIX] Allow be.container ViewHelper without Base Header Bar

Due to the replacment of DocumentTemplate with ModuleTemplate
the rendering is now different. In order to overcome this,
a new flag enableDocHeader is added.

see https://review.typo3.org/c/Packages/TYPO3.CMS/+/63290

Resolves: #90834
Releases: master
Change-Id: Ifb278f7dff1c9b1e18b09f7587dbe33caff13732
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64261


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>

typo3/sysext/backend/Resources/Private/Templates/EmptyModule.html

+<f:format.raw>{content}</f:format.raw>

typo3/sysext/fluid/Classes/ViewHelpers/Be/ContainerViewHelper.php

@@ -66,6 +66,7 @@ class ContainerViewHelper extends AbstractBackendViewHelper
         $this->registerArgument('includeJsFiles', 'array', 'List of custom JavaScript file to be loaded');
         $this->registerArgument('addJsInlineLabels', 'array', 'Custom labels to add to JavaScript inline labels');
         $this->registerArgument('includeRequireJsModules', 'array', 'List of RequireJS modules to be loaded');
+        $this->registerArgument('enableDocHeader', 'bool', 'Add an empty doc header', false);
     }
 
     /**
@@ -111,6 +112,12 @@ class ContainerViewHelper extends AbstractBackendViewHelper
         // Render the content and return it
         $output = $this->renderChildren();
         $moduleTemplate = $this->getModuleTemplate();
+        if ($this->arguments['enableDocHeader'] ?? false) {
+            $moduleTemplate->getDocHeaderComponent()->enable();
+        } else {
+            $moduleTemplate->getDocHeaderComponent()->disable();
+            $moduleTemplate->getView()->setTemplate('EmptyModule.html');
+        }
         $moduleTemplate->setTitle($pageTitle);
         $moduleTemplate->setContent($output);
         return $moduleTemplate->renderContent();