field_number - validation bug on an empty string.

When using the contributed field_number.inc field the validation enforces the field to REQUIRE a numeric value, even when the field is empty and it is not defined as a REQUIRED field.

To remove the check to see if the empty string is numeric the following code must be altered:

function flexinode_field_number_validate($field, $node) {
	$fieldname = 'flexinode_'. $field->field_id;
	if ($node->$fieldname != '' && !is_numeric($node->$fieldname)) {
		form_set_error($fieldname, t('Please input a valid number in %field', array('%field' => $field->label)));
	}

}

I don't know who is responsible for the contrib directory maintenance now...?