PHP Error on field settings form when a new condition plugin added but not in the field config yet

Problem/Motivation

When adding a new condition plugin, and trying to add this to the condition field of a custom entity, I saw a php error on the field settings form for editing the condition field settings.

Notice: Undefined index: bhcc_is_portal in Drupal\condition_field\Plugin\Field\FieldType\ConditionFieldItem->fieldSettingsForm() (line 107 of modules/contrib/condition_field/src/Plugin/Field/FieldType/ConditionFieldItem.php).

Looks like $settings['enabled_plugins'][$condition_id] === TRUE expects all conditions avalible to already be part of the field config.
Saving the field settings and exporting the config does fix the error, as it now exports with the new condition plugin.

Steps to reproduce

1. Create a condition field on an entity.
2. Add a module with a new condition plugin (custom or contrib).
3. Go to the field settings form page of the condition field (from the entity manage fields and click edit).
4. PHP error should be visible

Proposed resolution

Check that the condition exists in config before checking is enabled.
I'll see if I can write a patch.