From baa4ae83ee87a35064c7466d41128aa86b0a7b20 Mon Sep 17 00:00:00 2001
From: Matthias Schmidt <gravatronics@live.com>
Date: Wed, 12 May 2021 12:25:37 +0200
Subject: [PATCH] Use/Add explicit `return null;` statement

---
 .../data/conversation/message/ConversationMessage.class.php | 2 +-
 .../clipboard/action/ConversationClipboardAction.class.php  | 6 +++---
 files/lib/system/search/ConversationMessageSearch.class.php | 2 ++
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/files/lib/data/conversation/message/ConversationMessage.class.php b/files/lib/data/conversation/message/ConversationMessage.class.php
index 4746e28..548ae64 100644
--- a/files/lib/data/conversation/message/ConversationMessage.class.php
+++ b/files/lib/data/conversation/message/ConversationMessage.class.php
@@ -86,7 +86,7 @@ class ConversationMessage extends DatabaseObject implements IMessage
             ]);
 
             if ($ignoreCache && !\count($attachmentList)) {
-                return;
+                return null;
             }
 
             return $attachmentList;
diff --git a/files/lib/system/clipboard/action/ConversationClipboardAction.class.php b/files/lib/system/clipboard/action/ConversationClipboardAction.class.php
index d1d1ca7..e802bab 100644
--- a/files/lib/system/clipboard/action/ConversationClipboardAction.class.php
+++ b/files/lib/system/clipboard/action/ConversationClipboardAction.class.php
@@ -54,13 +54,13 @@ class ConversationClipboardAction extends AbstractClipboardAction
 
         // check if no conversation was accessible
         if (empty($this->conversations)) {
-            return;
+            return null;
         }
 
         $item = parent::execute($objects, $action);
 
         if ($item === null) {
-            return;
+            return null;
         }
 
         switch ($action->actionName) {
@@ -73,7 +73,7 @@ class ConversationClipboardAction extends AbstractClipboardAction
                 $statement->execute([WCF::getUser()->userID]);
                 $row = $statement->fetchArray();
                 if ($row['count'] == 0) {
-                    return;
+                    return null;
                 }
 
                 $item->addParameter('objectIDs', \array_keys($this->conversations));
diff --git a/files/lib/system/search/ConversationMessageSearch.class.php b/files/lib/system/search/ConversationMessageSearch.class.php
index f8bcaef..67d3977 100644
--- a/files/lib/system/search/ConversationMessageSearch.class.php
+++ b/files/lib/system/search/ConversationMessageSearch.class.php
@@ -145,6 +145,8 @@ class ConversationMessageSearch extends AbstractSearchableObjectType
         if ($this->conversation) {
             return 'searchConversationMessage';
         }
+
+        return null;
     }
 
     /**
-- 
2.20.1