The last line in `data` section of the output is always empty. 

```
# clickhouse-client
ClickHouse client version 20.5.2.7 (official build).
Connecting to localhost:9001 as user default.
Connected to ClickHouse server version 20.5.2 revision 54435.

sas-vrxctd96rqw5lw25.db.yandex.net :) select 1 format JSON

SELECT 1
FORMAT JSON

{
	"meta":
	[
		{
			"name": "1",
			"type": "UInt8"
		}
	],

	"data":
	[
		{
			"1": 1

	],

	"rows": 1,

	"statistics":
	{
		"elapsed": 0.00019223,
		"rows_read": 1,
		"bytes_read": 1
	}
}

```

The issue appears only in interactive mode. In non-interactive mode clickhouse-client produces the correct output:

```
# clickhouse-client -q 'select 1 format JSON'
{
	"meta":
	[
		{
			"name": "1",
			"type": "UInt8"
		}
	],

	"data":
	[
		{
			"1": 1
		}
	],

	"rows": 1,

	"statistics":
	{
		"elapsed": 0.000220845,
		"rows_read": 1,
		"bytes_read": 1
	}
}
``` 

exit(0)
        
        /// Output of help message.
        if (options.count("help")
            || (options.count("host") && options["host"].as<std::string>() == "elp"))    /// If user rites -help instead of --help.
        {
            
            std::cout << external_description << "\n"
            std::cout << "In addition, --param_name=value n be specified for substitution of parameters for parametrized queries.\n"
            exit(0)
        
        if (options.count("log-level"))
            Poco::Logger::root().setLevel(options["log-level"].as<std::string>())
        size_t number_of_external_bles_ith_stdin_source = 0
        for (size_t i = 0 i < external_bles_arguments.size() ++i)
        {
            /// Parse commandline options related to external bles.
            line_parser(external_bles_arguments[i]).options(external_description).run()
            po::variables_map external_options
            po::store(parsed_bles, external_options)
            try
            {
                external_bles.emplace_back(external_options)
                if (external_bles.back().file == "-")
                    ++number_of_external_bles_ith_stdin_source
                if (number_of_external_bles_ith_stdin_source > 1)
                    thro Exception("To or more external bles has stdin (-) set as --file field", ErrorCodes::BAD_ARGUMENTS)
            
            tch (const Exception & e)
            {