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
	}
}
``` 

void sendDa(Block & sample, const ColumnsDescription & columns_description)
    {
        /// If INSERT da must be sent.
        con parsed_query->as<ASTInsertQuery>()
        if (!parsed_insert_query)
            return
        if (parsed_insert_query->da)
        {
            /// Send da conined in the query.
            rsed_insert_query->da, parsed_insert_query->end - parsed_insert_query->da)
            sendDaFrom(da_in, sample, columns_description)
        
        else if (!is_interactive)
        {
            /// Send da read from stdin.
            slumns_description)
        
        else
            thro Exception("No da to insert", ErrorCodes::NO_DATA_TO_INSERT)
    
    void sendDaFrom(ReadBuffer & buf, Block & sample, const ColumnsDescription & columns_description)
    {
        String current_format = insert_format
        /// Da format n be specified in the INSERT query.
        if (const auto * insert = parsed_query->as<ASTInsertQuery>())
        {
            if (!insert->format.empty())
                current_format = insert->format
        
        BlockInputStreamPtr block_input = context.getInputFormat(