[BUGFIX] Do not render menus, if settings are empty

Check if there are pages selected in the respective menu field before running the data actual processing
to avoid menu pages determined from empty settings.

ext_localconf.php

@@ -10,12 +10,31 @@
 
         $menuIndex = 100;
         foreach ($menuConfiguration->getActiveMenus() as $menu => $configuration) {
-            $typoScriptSetup .= sprintf(
-<<<EOTS
-page.20.dataProcessing.{$menuIndex} = %s
-page.20.dataProcessing.{$menuIndex} {
-    as = menu%s
-    levels = %s
+            $typoScriptSetup .= sprintf('
+page.20.dataProcessing.%1$d = %2$s
+page.20.dataProcessing.%1$d {
+    as = menu%3$s
+    levels = %4$s
+    if.isTrue.cObject = CONTENT
+    if.isTrue.cObject {
+        table = pages
+        select {
+            pidInList.data = leveluid:0
+            recursive = 10
+            join = tx_editablemenus_menu_pages_mm m ON m.uid_foreign=pages.uid
+            where {
+                data = leveluid:0
+                wrap = {#m.field_name} = "%5$s_menu" AND {#m.uid_local}=|
+            }
+            orderBy = m.sorting asc
+        }
+        renderObj = TEXT
+        renderObj {
+            field = uid
+            wrap = |,
+        }
+        stdWrap.substring = 0,-1
+    }
     special = list
     special.value.cObject = CONTENT
     special.value.cObject {
@@ -26,7 +45,7 @@
             join = tx_editablemenus_menu_pages_mm m ON m.uid_foreign=pages.uid
             where {
                 data = leveluid:0
-                wrap = {#m.field_name} = "%s_menu" AND {#m.uid_local}=|
+                wrap = {#m.field_name} = "%5$s_menu" AND {#m.uid_local}=|
             }
             orderBy = m.sorting asc
         }
@@ -38,8 +57,7 @@
         stdWrap.substring = 0,-1
     }
 }
-
-EOTS, \TYPO3\CMS\Frontend\DataProcessing\MenuProcessor::class, \TYPO3\CMS\Core\Utility\GeneralUtility::underscoredToUpperCamelCase($menu), $configuration['levels'] ?? 1, $menu
+', $menuIndex, \TYPO3\CMS\Frontend\DataProcessing\MenuProcessor::class, \TYPO3\CMS\Core\Utility\GeneralUtility::underscoredToUpperCamelCase($menu), $configuration['levels'] ?? 1, $menu
         );
 
             ++$menuIndex;