When I want to display a product containing the datatype multioption2 I get the following error:

Fatal error: Call to a member function on a non-object in /var/www/admin.intra.mediata.com/software-source/ez-publish/GPL/ezpublish-3.10.0/kernel/classes/datatypes/ezmultioption2/ezmultioption2type.php on line 527
Fatal error: eZ Publish did not finish its request

This is caused by a bug in function hasObjectAttributeContent of class eZMultiOption2Type.

Instead of

function hasObjectAttributeContent( &$contentObjectAttribute )
    {
        $groups =& $contentObjectAttribute->content();
        $grouplist = $multioption->attribute( 'optiongroup_list' );
        return count( $grouplist ) > 0;
    }

it must be

function hasObjectAttributeContent( &$contentObjectAttribute )
    {
        $groups =& $contentObjectAttribute->content();
        $grouplist = $groups->attribute( 'optiongroup_list' );
        return count( $grouplist ) > 0;
    }

Steps to reproduce

Create a product which contains the datatype multioption2
Try to view the product in frontend