Conversation.markRead: Remove checks for unread

We will now always attempt to mark things unread if this method. If the
conversation's unreadCount gets out of date, set to zero, we will still
do it. If we go through the motions, and nothing is newly marked read,
we will still set the unreadCount to zero.

js/models/conversations.js

@@ -305,42 +305,38 @@
         options = options || {};
         _.defaults(options, {sendReadReceipts: true});
 
-        if (this.get('unreadCount') > 0) {
-            var conversationId = this.id;
-            Whisper.Notifications.remove(Whisper.Notifications.where({
-                conversationId: conversationId
-            }));
-
-            this.getUnread().then(function(unreadMessages) {
-                var oldUnread = unreadMessages.filter(function(message) {
-                    return message.get('received_at') <= newestUnreadDate;
-                });
-
-                var read = _.map(oldUnread, function(m) {
-                    if (this.messageCollection.get(m.id)) {
-                        m = this.messageCollection.get(m.id);
-                    } else {
-                        console.log('Marked a message as read in the database, but ' +
-                                    'it was not in messageCollection.');
-                    }
-                    m.markRead();
-                    return {
-                        sender    : m.get('source'),
-                        timestamp : m.get('sent_at')
-                    };
-                }.bind(this));
+        var conversationId = this.id;
+        Whisper.Notifications.remove(Whisper.Notifications.where({
+            conversationId: conversationId
+        }));
 
-                if (read.length > 0) {
-                    var unreadCount = unreadMessages.length - read.length;
-                    this.save({ unreadCount: unreadCount });
+        this.getUnread().then(function(unreadMessages) {
+            var oldUnread = unreadMessages.filter(function(message) {
+                return message.get('received_at') <= newestUnreadDate;
+            });
 
-                    if (options.sendReadReceipts) {
-                        console.log('Sending', read.length, 'read receipts');
-                        textsecure.messaging.syncReadMessages(read);
-                    }
+            var read = _.map(oldUnread, function(m) {
+                if (this.messageCollection.get(m.id)) {
+                    m = this.messageCollection.get(m.id);
+                } else {
+                    console.log('Marked a message as read in the database, but ' +
+                                'it was not in messageCollection.');
                 }
+                m.markRead();
+                return {
+                    sender    : m.get('source'),
+                    timestamp : m.get('sent_at')
+                };
             }.bind(this));
-        }
+
+            var unreadCount = unreadMessages.length - read.length;
+            this.save({ unreadCount: unreadCount });
+
+            if (read.length && options.sendReadReceipts) {
+                console.log('Sending', read.length, 'read receipts');
+                textsecure.messaging.syncReadMessages(read);
+            }
+        }.bind(this));
     },
 
     fetchMessages: function() {