Fix the mobile title sometimes disappearing

I was depending on an implicit connection property from somewhere.

src/rooms/ExploreComponent.qml

@@ -15,6 +15,7 @@ import org.kde.neochat
 RowLayout {
     id: root
 
+    required property NeoChatConnection connection
     property bool collapsed: false
 
     signal search
@@ -36,7 +37,7 @@ RowLayout {
                 } else if(RoomManager.currentSpace === 'DM') {
                     return i18nc("@title", "Direct Messages");
                 }
-                return root.connection.room(RoomManager.currentSpace).displayName;
+                return root.connection.room(RoomManager.currentSpace)?.displayName;
             }
             return i18nc("@title List of rooms", "Rooms");
         }

src/rooms/RoomListPage.qml

@@ -270,6 +270,7 @@ Kirigami.Page {
     Component {
         id: exploreComponent
         ExploreComponent {
+            connection: root.connection
             collapsed: root.collapsed
 
             onSearch: root.search()