[BUGFIX] Prevent warnings if DataHandler received record has no language

Warnings may trigger if the current BE user does not have access
to the language column of a record being moved. When this happens,
Flux will now attempt to read the language UID from the record as
stored in DB, or will default to the default language UID of zero.

Classes/Integration/HookSubscribers/DataHandlerSubscriber.php

@@ -120,13 +120,17 @@ public function processDatamap_afterDatabaseOperations($command, $table, $id, $f
             // of parent, rather, parent was pasted somewhere else).
             // If language of child record is different from resolved parent (copyToLanguage occurred), resolve the
             // right parent for the language and update the column position accordingly.
+            $recordUid = (integer) ($record['uid'] ?? $id);
             $originalParentUid = ColumnNumberUtility::calculateParentUid($fieldArray['colPos']);
             $originalParent = $this->getSingleRecordWithoutRestrictions($table, $originalParentUid, 'sys_language_uid');
-            if ($originalParent !== null && $originalParent['sys_language_uid'] !== $fieldArray['sys_language_uid']) {
+            $currentRecordLanguageUid = $fieldArray['sys_language_uid']
+                ?? $this->getSingleRecordWithoutRestrictions($table, $recordUid, 'sys_language_uid')['sys_language_uid']
+                ?? 0;
+            if ($originalParent !== null && $originalParent['sys_language_uid'] !== $currentRecordLanguageUid) {
                 // copyToLanguage case. Resolve the most recent translated version of the parent record in language of
                 // child record, and calculate the new column position number based on it.
                 $newParentRecord = $this->getTranslatedVersionOfParentInLanguageOnPage(
-                    (int) $fieldArray['sys_language_uid'],
+                    (int) $currentRecordLanguageUid,
                     (int) $fieldArray['pid'],
                     $originalParentUid
                 );