minor issue fix

Session/Conversations/Message Cells/VisibleMessageCell.swift

@@ -208,8 +208,7 @@ final class VisibleMessageCell : MessageCell, LinkPreviewViewDelegate {
     // MARK: Updating
     override func update() {
         guard let viewItem = viewItem, let message = viewItem.interaction as? TSMessage else { return }
-        let thread = message.thread
+        let isGroupThread = viewItem.isGroupThread
-        let isGroupThread = thread.isGroupThread()
         // Profile picture view
         profilePictureViewLeftConstraint.constant = isGroupThread ? VisibleMessageCell.groupThreadHSpacing : 0
         profilePictureViewWidthConstraint.constant = isGroupThread ? VisibleMessageCell.profilePictureSize : 0
@@ -218,8 +217,8 @@ final class VisibleMessageCell : MessageCell, LinkPreviewViewDelegate {
         if let senderSessionID = senderSessionID {
             profilePictureView.update(for: senderSessionID)
         }
-        if let thread = thread as? TSGroupThread, thread.isOpenGroup, let senderSessionID = senderSessionID {
+        if let senderSessionID = senderSessionID, message.isOpenGroupMessage {
-            if let openGroupV2 = Storage.shared.getV2OpenGroup(for: thread.uniqueId!) {
+            if let openGroupV2 = Storage.shared.getV2OpenGroup(for: message.uniqueThreadId) {
                 let isUserModerator = OpenGroupAPIV2.isUserModerator(senderSessionID, for: openGroupV2.room, on: openGroupV2.server)
                 moderatorIconImageView.isHidden = !isUserModerator || profilePictureView.isHidden
             } else {

Session/Open Groups/JoinOpenGroupVC.swift

@@ -143,7 +143,7 @@ final class JoinOpenGroupVC : BaseVC, UIPageViewControllerDataSource, UIPageView
             Storage.shared.write { transaction in
                 OpenGroupManagerV2.shared.add(room: room, server: server, publicKey: publicKey, using: transaction)
                 .done(on: DispatchQueue.main) { [weak self] _ in
-                    self?.presentingViewController!.dismiss(animated: true, completion: nil)
+                    self?.presentingViewController?.dismiss(animated: true, completion: nil)
                     let appDelegate = UIApplication.shared.delegate as! AppDelegate
                     appDelegate.forceSyncConfigurationNowIfNeeded().retainUntilComplete() // FIXME: It's probably cleaner to do this inside addOpenGroup(...)
                 }