Fix undefined behavior when all users are logged out.

imports/Spectral/Panel/RoomListPanel.qml

@@ -13,8 +13,8 @@ import Spectral.Setting 0.1
 import SortFilterProxyModel 0.2
 
 Item {
-    property var controller: null
-    readonly property var user: controller.connection ? controller.connection.localUser : null
+    property var connection: null
+    readonly property var user: connection ? connection.localUser : null
 
     property int filter: 0
     property var enteredRoom: null
@@ -28,7 +28,7 @@ Item {
     RoomListModel {
         id: roomListModel
 
-        connection: controller.connection
+        connection: root.connection
 
         onNewMessage: if (!window.active && MSettings.showNotification) spectralController.postNotification(roomId, eventId, roomName, senderName, text, icon)
     }

qml/main.qml

@@ -371,7 +371,7 @@ ApplicationWindow {
 
             clip: true
 
-            controller: spectralController
+            connection: spectralController.connection
 
             onLeaveRoom: roomForm.saveReadMarker(room)
         }
@@ -420,7 +420,7 @@ ApplicationWindow {
 
     Component.onCompleted: {
         spectralController.initiated.connect(function() {
-            if (spectralController.accountCount == 0) loginDialog.open()
+            if (spectralController.accountCount == 0) loginDialog.createObject(window).open()
         })
     }
 }

src/controller.h

@@ -60,8 +60,6 @@ class Controller : public QObject {
   }
 
   void setConnection(Connection* conn) {
-    if (!conn)
-      return;
     if (conn == m_connection)
       return;
     m_connection = conn;