Ensure there is no timestamp in RoomListRoomSummary if lastMessage is null.

features/roomlist/impl/src/main/kotlin/io/element/android/features/roomlist/impl/model/RoomListRoomSummaryProvider.kt

@@ -28,10 +28,10 @@ open class RoomListRoomSummaryProvider : PreviewParameterProvider<RoomListRoomSu
             aRoomListRoomSummary(),
             aRoomListRoomSummary(lastMessage = null),
             aRoomListRoomSummary(hasUnread = true, notificationMode = RoomNotificationMode.MENTIONS_AND_KEYWORDS_ONLY),
-            aRoomListRoomSummary(timestamp = "88:88", notificationMode = RoomNotificationMode.MENTIONS_AND_KEYWORDS_ONLY),
-            aRoomListRoomSummary(timestamp = "88:88", notificationMode = RoomNotificationMode.MUTE),
-            aRoomListRoomSummary(timestamp = "88:88", hasUnread = true),
-            aRoomListRoomSummary(isPlaceholder = true, timestamp = "88:88"),
+            aRoomListRoomSummary(notificationMode = RoomNotificationMode.MENTIONS_AND_KEYWORDS_ONLY),
+            aRoomListRoomSummary(notificationMode = RoomNotificationMode.MUTE),
+            aRoomListRoomSummary(hasUnread = true),
+            aRoomListRoomSummary(isPlaceholder = true),
             aRoomListRoomSummary(
                 name = "A very long room name that should be truncated",
                 lastMessage = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt" +
@@ -48,8 +48,8 @@ internal fun aRoomListRoomSummary(
     id: String = "!roomId:domain",
     name: String = "Room name",
     hasUnread: Boolean = false,
-    timestamp: String? = "88:88",
     lastMessage: String? = "Last message",
+    timestamp: String? = if (lastMessage != null) "88:88" else null,
     isPlaceholder: Boolean = false,
     notificationMode: RoomNotificationMode? = null,
     hasRoomCall: Boolean = false,