Revert "Remove unregistered group members"

This reverts commit a768b94471.

d2ddfc7 was enough to fix #989. Removing unregistered members from the
group (as opposed to silently ignorning them) creates greater potential
for getting out of sync with the member lists on other devices.

// FREEBIE

js/models/conversations.js

@@ -62,19 +62,6 @@
         message.save().then(this.trigger.bind(this,'newmessage', message));
     },
 
-    addMemberLeft: function(source) {
-        var timestamp = Date.now();
-        var message = new Whisper.Message({
-            conversationId : this.id,
-            source         : source,
-            type           : 'incoming',
-            sent_at        : timestamp,
-            received_at    : timestamp,
-            group_update   : {left: source}
-        });
-        message.save().then(this.trigger.bind(this,'newmessage', message));
-    },
-
     onReadMessage: function(message) {
         if (this.messageCollection.get(message.id)) {
             this.messageCollection.get(message.id).fetch();

js/models/messages.js

@@ -201,39 +201,24 @@
                 this.sendSyncMessage();
             }.bind(this)).catch(function(result) {
                 var now = Date.now();
-                var errors;
-                var conversation = this.getConversation();
                 this.trigger('done');
                 if (result.dataMessage) {
                     this.set({dataMessage: result.dataMessage});
                 }
 
                 if (result instanceof Error) {
-                    errors = [result];
-                    this.saveErrors(errors);
+                    this.saveErrors(result);
                     if (result.name === 'SignedPreKeyRotationError') {
                         getAccountManager().rotateSignedPreKey();
                     }
                 } else {
-                    errors = result.errors;
-                    this.saveErrors(errors);
+                    this.saveErrors(result.errors);
                     if (result.successfulNumbers.length > 0) {
                         this.set({sent: true, expirationStartTimestamp: now});
                         this.sendSyncMessage();
                     }
                 }
 
-                if (conversation.get('type') === 'group') {
-                    errors.forEach(function(e) {
-                        if (e.name === 'UnregisteredUserError') {
-                            textsecure.storage.groups.removeNumber(conversation.id, e.number);
-                            conversation.addMemberLeft(e.number);
-                            conversation.set({
-                                members: _.without(conversation.get('members'), e.number)
-                            });
-                        }
-                    });
-                }
             }.bind(this));
         },