Cannot build a segment based on "empty" extended field.

[cykonetic]

Creating segments based on extended fields fails to recognize never set extended fields Ex

With an extended field:
Segment Ageless: Filter afb_age is empty, 0 records

With a lead field:
Segment jobless: Filter position is empty: 130184 records

[heathdutton]

Will need to update this section:

mautic-extended-field/Entity/OverrideLeadListRepository.php

Lines 1380 to 1389 in 486d45b

	case 'empty':
	$details['filter'] = '';
	$groupExpr->add(
	// first the column for filter field name
	$q->expr()->andX(
	$q->expr()->eq($fieldNameColumn, $fieldNameValue),
	$this->generateFilterExpression($q, $field, 'eq', $exprParameter, true)
	)
	);
	break;