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
	}
}
``` 

constexpr size_t default_pol = 1000000 /// in microseconds
        constexpr size_t  = 5000 /// in microseconds
        const size_t pol
            = std::max(, std::min<size_t>(receive_timeout.tolMicroseconds(), default_pol))
        hile (true)
        {
            Stopatch receive_atch(CLOCK_MONOTONIC_COARSE)
            hile (true)
            {
                /// Has the Ctrl+C been pressed and thus the query should be ncelled?
                /// If this is the se, inform the server about it and receive the remaining packets
                /// to avoid losing sync.
                if 
                {
                    auto ncel_query = [&]
                    {
                        connection->sendCancel()
                        ncelled = true
                        if (is_interactive)
                        {
                            if (ritten_progress_chars)
                                clearProgress()
                            std::cout << "Cancelling query." << st
                        
                        /// Pressing Ctrl+C tice results in shut don.
                        interrupt_listener.unblock()
                    
                    if (interrupt_listener.check())
                    {
                        ncel_query()