validate bucket before attempting batch replication (#15861)

cmd/api-errors.go

@@ -2228,6 +2228,12 @@ func toAPIError(ctx context.Context, err error) APIError {
 		// their internal error types. This code is only
 		// useful with gateway implementations.
 		switch e := err.(type) {
+		case batchReplicationJobError:
+			apiErr = APIError{
+				Code:           e.Code,
+				Description:    e.Description,
+				HTTPStatusCode: e.HTTPStatusCode,
+			}
 		case InvalidArgument:
 			apiErr = APIError{
 				Code:           "InvalidArgument",