recovery.conf doesn't include primary_conninfo for streaming replication

The recovery.conf template conditionally includes primary_conninfo for streaming replication, if enabled:
"""
standby_mode = on
recovery_target_timeline = latest
{% if streaming_replication %}
primary_conninfo = 'host={{host}} user=juju_replication password={{password}} requirepeer=postgres'
{% endif %}
{% if restore_command %}
restore_command = '{{restore_command}}'
{% endif %}
"""

streaming_replication is a config setting, and it's true by default.

The code that writes out the template file, however, doesn't give the streaming_replication variable to the template engine:
    recovery_conf = Template(open(template_file).read()).render({
        'host': master_host,
        'password': local_state['replication_password']})

So it's not rendered, and the second postgresql unit does no replication at all and remains read-only.