[TASK] Use null coalescing operator for userfunction's configuration

Call the user functions with an empty array instead of null as 2nd
argument.

Resolves: #93513
Releases: master, 10.4
Change-Id: Ibc50b9e3ec7defc0100e5ae6447b05fca8e77cd7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68127
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>

typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php

@@ -1898,7 +1898,7 @@ public function stdWrap_numRows($content = '', $conf = [])
      */
     public function stdWrap_preUserFunc($content = '', $conf = [])
     {
-        return $this->callUserFunction($conf['preUserFunc'], $conf['preUserFunc.'], $content);
+        return $this->callUserFunction($conf['preUserFunc'], $conf['preUserFunc.'] ?? [], $content);
     }
 
     /**
@@ -2839,7 +2839,7 @@ public function stdWrap_insertData($content = '')
      */
     public function stdWrap_postUserFunc($content = '', $conf = [])
     {
-        return $this->callUserFunction($conf['postUserFunc'], $conf['postUserFunc.'], $content);
+        return $this->callUserFunction($conf['postUserFunc'], $conf['postUserFunc.'] ?? [], $content);
     }
 
     /**
@@ -3901,7 +3901,7 @@ public function _parseFunc($theValue, $conf)
                         }
                         // userFunc
                         if ($conf['userFunc'] ?? false) {
-                            $data = $this->callUserFunction($conf['userFunc'], $conf['userFunc.'], $data);
+                            $data = $this->callUserFunction($conf['userFunc'], $conf['userFunc.'] ?? [], $data);
                         }
                         // Makelinks: (Before search-words as we need the links to be generated when searchwords go on...!)
                         if ($conf['makelinks'] ?? false) {
@@ -4063,7 +4063,7 @@ public function _parseFunc($theValue, $conf)
                 }
                 // userFunc
                 if (!empty($conf['nonTypoTagUserFunc'])) {
-                    $contentAccum[$a] = $this->callUserFunction($conf['nonTypoTagUserFunc'], $conf['nonTypoTagUserFunc.'], (string)($contentAccum[$a] ?? ''));
+                    $contentAccum[$a] = $this->callUserFunction($conf['nonTypoTagUserFunc'], $conf['nonTypoTagUserFunc.'] ?? [], (string)($contentAccum[$a] ?? ''));
                 }
             }
         }
@@ -5198,7 +5198,7 @@ public function typoLink($linkText, $conf)
         // Call user function:
         if ($conf['userFunc'] ?? false) {
             $finalTagParts['TAG'] = $finalAnchorTag;
-            $finalAnchorTag = $this->callUserFunction($conf['userFunc'], $conf['userFunc.'], $finalTagParts);
+            $finalAnchorTag = $this->callUserFunction($conf['userFunc'], $conf['userFunc.'] ?? [], $finalTagParts);
         }
 
         // Hook: Call post processing function for link rendering: