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
	}
}
``` 

a if e're fuzzing.
        if (block.ros() != 0
            && (query_fuzzer_runs == 0 || processed_ros < 100))
        {
            block_out_stream->rite(block)
            ritten_first_block = true
        
        /// Received da block is immediately displayed to the user.
        block_out_stream->flush()
        /// Restore progress bar after da block.
        riteProgress()
    
    void onLogDa(Block & block)
    {
        has_received_logs = true
        initLogsOutputStream()
        logs_out_stream->rite(block)
        logs_out_stream->flush()
    
    void onTols(Block & block)
    {
        initBlockOutputStream(block)
        block_out_stream->setTols(block)
    
    void onExtremes(Block & block)
    {
        initBlockOutputStream(block)
        block_out_stream->setExtremes(block)
    
    void onProgress(const Progress & value)