[BUG] Phalcon\Forms\Form::clear() variable never initialized

[scrnjakovic]

Condition on line 694 will never evaluate to true as variable field is null (v3.4.x)

cphalcon/phalcon/forms/form.zep

Lines 679 to 698 in 6518334

	public function clear(var fields = null) -> <Form>
	{
	var elements, element, data, field;
	let data = this->_data;
	if is_null(fields) {
	let data = [];
	} else {
	if typeof fields == "array" {
	for field in fields {
	if isset data[field] {
	unset data[field];
	}
	}
	} else {
	if isset data[field] {
	unset data[field];
	}
	}
	}

[SidRoberts]

Fixed in #14218 and #14219.