Minor - message.user_receiver_id can have a NULL value used

app/Migrations/Schema/V200/Version20.php

@@ -169,10 +169,12 @@ class Version20 extends AbstractMigrationChamilo
         $this->addSql('UPDATE session_category SET date_end = NULL WHERE date_end = "0000-00-00"');
 
         $this->addSql('DELETE FROM message WHERE user_sender_id IS NULL OR user_sender_id = 0');
-        $this->addSql('DELETE FROM message WHERE user_receiver_id IS NULL OR user_sender_id = 0');
+
+        $this->addSql('ALTER TABLE message CHANGE user_receiver_id user_receiver_id INT DEFAULT NULL');
+        $this->addSql('UPDATE message SET user_receiver_id = NULL WHERE user_receiver_id = 0');
 
         $this->addSql('DELETE FROM message WHERE user_sender_id NOT IN (SELECT id FROM user)');
-        $this->addSql('DELETE FROM message WHERE user_receiver_id NOT IN (SELECT id FROM user)');
+        $this->addSql('DELETE FROM message WHERE user_receiver_id IS NOT NULL AND user_receiver_id NOT IN (SELECT id FROM user)');
 
         $this->addSql('ALTER TABLE message ADD CONSTRAINT FK_B6BD307FF6C43E79 FOREIGN KEY (user_sender_id) REFERENCES user (id)');
         $this->addSql('ALTER TABLE message ADD CONSTRAINT FK_B6BD307F64482423 FOREIGN KEY (user_receiver_id) REFERENCES user (id)');
@@ -502,7 +504,7 @@ class Version20 extends AbstractMigrationChamilo
 
         // Portfolio
         if (!$schema->hasTable('portfolio')) {
-            $this->addSql('CREATE TABLE portfolio_category (id INT AUTO_INCREMENT NOT NULL, user_id INT NOT NULL, title LONGTEXT NOT NULL, description LONGTEXT DEFAULT NULL, is_visible TINYINT(1) DEFAULT "1" NOT NULL, INDEX user (user_id), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB;');
+            $this->addSql('CREATE TABLE portfolio_category (id INT AUTO_INCREMENT NOT NULL, user_id INT NOT NULL, title LONGTEXT DEFAULT NULL, description LONGTEXT DEFAULT NULL, is_visible TINYINT(1) DEFAULT "1" NOT NULL, INDEX user (user_id), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB;');
             $this->addSql('CREATE TABLE portfolio (id INT AUTO_INCREMENT NOT NULL, user_id INT NOT NULL, c_id INT DEFAULT NULL, session_id INT DEFAULT NULL, category_id INT DEFAULT NULL, title LONGTEXT NOT NULL, content LONGTEXT NOT NULL, creation_date DATETIME NOT NULL, update_date DATETIME NOT NULL, is_visible TINYINT(1) DEFAULT "1" NOT NULL, INDEX user (user_id), INDEX course (c_id), INDEX session (session_id), INDEX category (category_id), PRIMARY KEY(id)) DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE = InnoDB;');
             $this->addSql('ALTER TABLE portfolio_category ADD CONSTRAINT FK_7AC64359A76ED395 FOREIGN KEY (user_id) REFERENCES user (id) ON DELETE CASCADE');
             $this->addSql('ALTER TABLE portfolio ADD CONSTRAINT FK_A9ED1062A76ED395 FOREIGN KEY (user_id) REFERENCES user (id);');

main/inc/lib/message.lib.php

@@ -464,7 +464,7 @@ class MessageManager
             return false;
         } elseif ($totalFileSize > intval(api_get_setting('message_max_upload_filesize'))) {
             $warning = sprintf(
-                get_lang("FilesSizeExceedsX"),
+                get_lang('FilesSizeExceedsX'),
                 format_file_size(api_get_setting('message_max_upload_filesize'))
             );
 
@@ -481,15 +481,14 @@ class MessageManager
             //@todo it's possible to edit a message? yes, only for groups
             if (!empty($editMessageId)) {
                 $query = " UPDATE $table SET
-                                update_date = '".$now."',
-                                content = '".Database::escape_string($content)."'
+                              update_date = '".$now."',
+                              content = '".Database::escape_string($content)."'
                            WHERE id = '$editMessageId' ";
                 Database::query($query);
                 $messageId = $editMessageId;
             } else {
                 $params = [
                     'user_sender_id' => $user_sender_id,
-                    'user_receiver_id' => $receiver_user_id,
                     'msg_status' => MESSAGE_STATUS_UNREAD,
                     'send_date' => $now,
                     'title' => $subject,
@@ -498,6 +497,9 @@ class MessageManager
                     'parent_id' => $parent_id,
                     'update_date' => $now,
                 ];
+                if (!empty($receiver_user_id)) {
+                    $params['user_receiver_id'] = $receiver_user_id;
+                }
                 $messageId = Database::insert($table, $params);
             }
 

src/CoreBundle/Entity/Message.php

@@ -44,7 +44,7 @@ class Message
      * @var User
      *
      * @ORM\ManyToOne(targetEntity="Chamilo\UserBundle\Entity\User", inversedBy="receivedMessages")
-     * @ORM\JoinColumn(name="user_receiver_id", referencedColumnName="id", nullable=false)
+     * @ORM\JoinColumn(name="user_receiver_id", referencedColumnName="id", nullable=true)
      */
     protected $userReceiver;