Properly process update of chats without accessHash

[Kaffeine]

A chat object from Updates typically has a subset of Chat properties from that of GetDialogs.
Especially an object from Updates has no AccessHash and currently it breaks any further access to that chat.

Updates received after GetDialogs override accessHash making the chat inaccessible. We have to properly process such Updates and probably update only the needed values.

Update:

TLUpdates(Updates) {
    updates: QVector(TLUpdate(UpdateEditChannelMessage) {
        message: TLMessage(Message) {
            flags: 58560
            id: 277
            toId: TLPeer(PeerChannel) {
                channelId: 1374347484
            }
            date: 1546154527
            message: <text>
            replyMarkup: TLReplyMarkup(ReplyInlineMarkup) {
                rows: QVector(TLKeyboardButtonRow(KeyboardButtonRow) {
                    buttons: QVector(TLKeyboardButton(KeyboardButtonCallback) {
                        text: 1 317
                        data: 73656e645f7265616374696f6e5f30
                    }, TLKeyboardButton(KeyboardButtonCallback) {
                        text: 2 2.3K
                        data: 73656e645f7265616374696f6e5f31
                    }, TLKeyboardButton(KeyboardButtonCallback) {
                        text: 3 266
                        data: 73656e645f7265616374696f6e5f32
                    })
                })
            }
            entities: QVector(TLMessageEntity(MessageEntityTextUrl) {
                offset: 57
                length: 5
                url: http://t.me/address/111
            })
            views: 999
            editDate: 1546203087
        }
        pts: 22222
        ptsCount: 1
    })
    users: QVector()
    chats: QVector(TLChat(Channel) {
        flags: 4192
        id: 1374347484
        title: Chat title
        username: chatname
        photo: TLChatPhoto(ChatPhoto) {
            photoSmall: TLFileLocation(FileLocation) {
                dcId: 2
                volumeId: 235137777
                localId: 266666
                secret: 7354674039851243333
            }
            photoBig: TLFileLocation(FileLocation) {
                dcId: 2
                volumeId: 235134444
                localId: 264444
                secret: 11777733401610977766
            }
        }
        date: 1514566666
        version: 0
    })
    date: 1546207777
    seq: 0
}

Typical chat object in the getDialogs respond:

TLChat(Channel) {
        flags: 8288
        id: 1007454380
        accessHash: 12585072710627688359
        title: Reddit
        username: RedditTop
        photo: TLChatPhoto(ChatPhoto) {
            photoSmall: TLFileLocation(FileLocation) {
                dcId: 2
                volumeId: 713315988
                localId: 61305
                secret: 17238258621322230518
            }
            photoBig: TLFileLocation(FileLocation) {
                dcId: 2
                volumeId: 713315988
                localId: 61307
                secret: 429123949706685596
            }
        }
        date: 1527080586
        version: 0
    }