Empty checkbox fields won't save

[jalendport]

Description

When you have a checkbox field on an entry and none of the option(s) are selected, saving the entry results in a Couldn’t save entry. error. The checkbox field is highlighted and says CheckboxField is invalid.

Looking in the logs I see:

2019-02-14 11:48:13 [-][1][-][info][craft\services\Elements::saveElement] Element not saved due to validation error: Array
(
    [testField[0].options[0].misc] => Array
        (
            [0] => CheckboxField is invalid.
        )

)

I just upgraded to the latest version of Craft CMS this morning so 99% sure this was introduced in one of the last couple releases (3.1.8 +).

Steps to reproduce

1. Create a checkbox field and add it to a section
2. Try to save entry without selecting any of the checkbox field(s)

Additional info

• Craft version: Craft CMS 3.1.10
• PHP version: PHP 7.1.25
• Database driver & version: MySQL 5.5.5
• Plugins & versions: tested on a clean install with no plugins

[samhernandez]

I've replicated the error on a fresh installation of Craft 3.1.10, PHP 7.2.10, PostgreSQL 11.1

[jalendport]

Thanks @samhernandez and @brandonkelly 🙌

[brandonkelly]

Just released 3.1.11 with a fix for this.