Add test

tests/queries/0_stateless/02731_zero_objects_in_metadata.reference

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+1	[]
+1	[]
+[]

tests/queries/0_stateless/02731_zero_objects_in_metadata.sh

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+#!/usr/bin/env bash
+
+CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CURDIR"/../shell_config.sh
+
+${CLICKHOUSE_CLIENT} -n --query "
+DROP TABLE IF EXISTS test;
+CREATE TABLE test (id Int32, empty Array(Int32))
+    ENGINE=MergeTree ORDER BY id
+    SETTINGS min_rows_for_wide_part=0, min_bytes_for_wide_part=0, storage_policy='s3';
+
+INSERT INTO test (id) VALUES (1);
+SELECT * FROM test;
+"
+
+${CLICKHOUSE_CLIENT} -n --query "
+BACKUP TABLE test TO Disk('backups', 'test_s3_backup');
+DROP TABLE test;
+RESTORE TABLE test FROM Disk('backups', 'test_s3_backup');
+" &>/dev/null
+
+${CLICKHOUSE_CLIENT} -n --query "
+SELECT * FROM test;
+SELECT empty FROM test;
+"