refactor(ReadHistoryQuery): update to not throw exception.

- update controller to throw NotFound if the list is empty

EnvelopeGenerator.Application/Histories/Queries/ReadHistoryQueryHandler.cs

@@ -42,10 +42,6 @@ public class ReadHistoryQueryHandler : IRequestHandler<ReadHistoryQuery, IEnumer
             query = query.Where(h => h.Status == request.Status);
 
         var hists = await query.ToListAsync(cancel);
-
-        if (hists.Count == 0)
-            return _mapper.Map<IEnumerable<EnvelopeHistoryDto>>(hists);
-
-        throw new NotFoundException();
+        return _mapper.Map<IEnumerable<EnvelopeHistoryDto>>(hists);
     }
 }