Error 500 on listing ContactFields with a filter

Where

On the API, when accessing as a system admin user. End point is contactFields List.

Mautic version is 2.15.1

Installation using Docker

Expected

Currently, despite the docs having no information on how to use filters (this needs to be remedied) I've seen in tests that filters follow the format $search = "id:45"; or $search = "alias:myalias";.

Using them would make the code look like this:

$fieldsApi = $this->api->newApi("contactFields", $this->auth, $this->api_url);
$search = "id:45";
$response = $fieldsApi->getList($search);

Using this on a Contact Field List function should return Fields filtered to ID 45.

Actual

API returns a 500 error. Error log in Mautic is as follows:

[2019-07-20 15:15:19] mautic.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\FatalThrowableError: "Call to a member function trans() on null" at /var/www/html/app/bundles/CoreBundle/Entity/CommonRepository.php line 1727 {"exception":"[object] (Symfony\\Component\\Debug\\Exception\\FatalThrowableError(code: 0): Call to a member function trans() on null at /var/www/html/app/bundles/CoreBundle/Entity/CommonRepository.php:1727)"} []

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Start with app/bundles/CoreBundle/Entity/CommonRepository.php around line 1727 and trace the contactFields List request using the documented filter forms such as id:45. Reproduce the request against Mautic 2.15.1 with the API example in the issue. Done means the request no longer returns a 500 and filtering by ID returns the matching contact field; the missing filter documentation is also noted in the issue scope.