[BUGFIX] Render plugin content element only if a plugin is selected

This patch ensures, that the plugin content element only calls the
f:cObject viewHelper, when a plugin is selected in the list of
available plugins.

Resolves: #92413
Releases: master, 10.4, 9.5
Change-Id: I0fc8de43d5f72b6e113a00ed224c888da1981737
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65863

Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/fluid_styled_content/Resources/Private/Templates/List.html

@@ -2,7 +2,9 @@
 <f:layout name="Default" />
 <f:section name="Main">
 
-	<f:cObject typoscriptObjectPath="tt_content.list.20.{data.list_type}" data="{data}" table="tt_content" />
+	<f:if condition="{data.list_type}">
+		<f:cObject typoscriptObjectPath="tt_content.list.20.{data.list_type}" data="{data}" table="tt_content" />
+	</f:if>
 
 </f:section>
 </html>