fix: return as-is if model validation failed for query

Author: ikesnowy

src/Cnblogs.Architecture.Ddd.Cqrs.AspNetCore/QueryEndpointHandler.cs

@@ -29,6 +29,11 @@ public QueryEndpointHandler(IMediator mediator)
             return query;
         }
 
+        if (query is not IBaseRequest)
+        {
+            return query;
+        }
+
         var response = await _mediator.Send(query);
         return response;
     }