The stupid patch to core entity for drupal 7.15

patch_i_need.php

 if(!empty($ids)){
    $ids2 = array_filter($ids);
    
    if(!is_null($ids2)){
        $ids2 = array_filter($ids2, 'is_string');
      }
      if(!is_null($ids2)){
        $ids2 = array_filter($ids2, 'strlen');
      }
    }else{
      $ids2 = array();
    }
    $passed_ids = !empty($ids2) ? array_flip($ids2) : FALSE;
    //$passed_ids = !empty($ids) ? array_flip($ids) : FALSE;

LINE 178 : Solves the "warning array_flip .. blah blah"