minor refactor

SessionMessagingKit/Sending & Receiving/MessageReceiver+Handling.swift

@@ -226,14 +226,17 @@ extension MessageReceiver {
         guard message.sender == message.author else { return }
         let userPublicKey = getUserHexEncodedPublicKey()
         let transaction = transaction as! YapDatabaseReadWriteTransaction
-        if let author = message.author, let timestamp = message.timestamp,
+        if let author = message.author, let timestamp = message.timestamp {
-           let messageToDelete = userPublicKey == message.sender ? TSOutgoingMessage.find(withTimestamp: timestamp) : TSIncomingMessage.find(withAuthorId: author, timestamp: timestamp, transaction: transaction) {
+            let localMessage: TSMessage?
+            if userPublicKey == message.sender { localMessage = TSOutgoingMessage.find(withTimestamp: timestamp) }
+            else { localMessage = TSIncomingMessage.find(withAuthorId: author, timestamp: timestamp, transaction: transaction) }
+            
+            if let messageToDelete = localMessage {
                 if let incomingMessage = messageToDelete as? TSIncomingMessage {
                     incomingMessage.markAsReadNow(withSendReadReceipt: false, transaction: transaction)
                     if let notificationIdentifier = incomingMessage.notificationIdentifier, !notificationIdentifier.isEmpty {
                         UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: [notificationIdentifier])
                         UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: [notificationIdentifier])
-                    
                     }
                 }
                 if let serverHash = messageToDelete.serverHash {
@@ -242,6 +245,7 @@ extension MessageReceiver {
                 messageToDelete.updateForDeletion(with: transaction)
             }
         }
+    }
     
     
     // MARK: - Visible Messages