Prevent calling of received message data for setting day marker if it is empty

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -69,8 +69,10 @@ private const val BUNDLE_CHAT_ROOM_LAST_SEEN = "chat_room_last_seen"
 private const val BUNDLE_CHAT_ROOM_IS_SUBSCRIBED = "chat_room_is_subscribed"
 
 class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiReactionListener {
-    @Inject lateinit var presenter: ChatRoomPresenter
-    @Inject lateinit var parser: MessageParser
+    @Inject
+    lateinit var presenter: ChatRoomPresenter
+    @Inject
+    lateinit var parser: MessageParser
     private lateinit var adapter: ChatRoomAdapter
     private lateinit var chatRoomId: String
     private lateinit var chatRoomName: String
@@ -179,7 +181,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
     }
 
     override fun showMessages(dataSet: List<BaseViewModel<*>>) {
-
+        if (!dataSet.isEmpty()) {
             var prevMsgModel = dataSet[0]
 
             // checking for all messages to assign true to the required showDayMaker
@@ -197,6 +199,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
                     }
                 }
             }
+        }
 
         // track the message sent immediately after the current message
         var prevMessageViewModel: MessageViewModel? = null