Warning when code field has no label option

[steve231293]

Issue description:

Please test code field type when it has no label option

Version used: 3.0.16

(Did you try using the develop branch from github? There's a chance your issue has already been adressed there)

Using theme_mods or options?

Code to reproduce the issue (config + field(s))

Kirki::add_field( 'theme', array(
'type' => 'code',
'settings' => 'custom_css',
'section' => 'custom',
'priority' => 1,
'choices' => array(
'language' => 'css',
'theme' => 'monokai',
),
'transport' => 'postMessage',
) );

[aristath]

Fixed, will be included in 3.0.17