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
	}
}
``` 

current_format, buf, sample, insert_format_max_block_size)
        const auto & column_defaults = columns_description.getDefaults()
        if (!column_defaults.empty())
            block_input = std::make_shared<AddingDefaultsBlockInputStream>(block_input, column_defaults, context)
        BlockInputStreamPtr async_block_input = std::make_shared<AsynchronousBlockInputStream>(block_input)
        async_block_input->readPrefix()
        hile (true)
        {
            Block block = async_block_input->read()
            /// Check if server send Log packet
            receiveLogs()
            /// Check if server send Exception packet
            checkPacket()
            if (packet_type && *packet_type == Protocol::Server::Exception)
            {
                /*
                 * We're exiting ith error, so it makes sense to kill the
                 * input stream ithout aiting for it to complete.
                 */
                async_block_input->ncel(true)
                return
            
            connection->sendDa(block)
            processed_ros += block.ros()
            if (!block)
                break
        
        async_block_input->readSuffix()
    
    /// Flush all buffers.