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
	}
}
``` 

{
                    thro
                
            
        
    
    /// Process the query that requires transferring da blocks to the server.
    void processInsertQuery()
    {
        const auto parsed_insert_query = parsed_query->as<ASTInsertQuery &>()
        if (!parsed_insert_query.da && (is_interactive || (!stdin_is_a_tty && std_in.eof())))
            thro Exception("No da to insert", ErrorCodes::NO_DATA_TO_INSERT)
        connection->sendQuery(
            connection_parameters.timeouts,
            query_to_send,
            query_id,
            QueryProcessingSge::Complete,
            &context.getSettingsRef(),
            &context.getClientInfo(),
            true)
        sendExternalTables()
        /// Receive description of ble structure.
        Block sample
        ColumnsDescription columns_description
        if (receiveSampleBlock(sample, columns_description))
        {
            /// If structure as received (thus, server has not thron an exception),
            /// send our da ith that structure.
            ption)
            receiveEndOfQuery()