add messenger back

Change-Id: I59baede92e0ee8218b7f27657c5f4bc5de06c092
diff --git a/model/Conversation.js b/model/Conversation.js
index d5c41de..8046219 100644
--- a/model/Conversation.js
+++ b/model/Conversation.js
@@ -1,7 +1,7 @@
 class Conversation {
     constructor(id, members) {
         this.id = id
-        this.members = members
+        this.members = members || []
         this.messages = []
     }
 
@@ -12,13 +12,12 @@
     getId() { return this.id }
 
     getDisplayName() {
-        return this.details["Account.displayName"] || this.getDisplayUri()
+        if (this.members.length !== 0) {
+            return this.members[0].getDisplayName()
+        }
+        return this.getDisplayUri()
     }
 
-    getUri() { return this.details["Account.username"] }
-
-    getRegisteredName() { return this.volatileDetails["Account.registeredName"] }
-
     getObject() {
         return {
             id: this.id,
@@ -31,7 +30,7 @@
     }
 
     getDisplayUri() {
-        return this.getRegisteredName() || this.getUri()
+        return this.getId()
     }
 
     addMessage(message) {