[OneBot] Fixed bug that ReplySegment.cs may not be received when targ…

…et msg is not in Database

Lagrange.OneBot/Message/Entity/ReplySegment.cs

@@ -32,7 +32,6 @@ public override void Build(MessageBuilder builder, SegmentBase segment)
     public override SegmentBase FromEntity(MessageChain chain, IMessageEntity entity)
     {
         if (entity is not ForwardEntity forward || Database is null) throw new ArgumentException("The entity is not a forward entity.");
-
 
         var collection = Database.GetCollection<MessageRecord>();
 
@@ -42,11 +41,10 @@ public override SegmentBase FromEntity(MessageChain chain, IMessageEntity entity
         var query = chain.IsGroup
             ? collection.Query().Where(x => x.Sequence == forward.Sequence).Where(x => x.GroupUin == groupUin)
             : collection.Query().Where(x => x.Sequence == forward.Sequence).Where(x => x.FriendUin == friendUin);
-        var target = query.First();
+        var target = query.FirstOrDefault();
 
-        return new ReplySegment
-        {
-            MessageId = target.MessageHash.ToString()
-        };
+        return target == null
+            ? new ReplySegment { MessageId = 0.ToString() }
+            : new ReplySegment { MessageId = target.MessageHash.ToString() };
     }
 }