Component type file :: PDOException - Column 'data' cannot be null

Hi,

I installed webform 7.x-3.3-beta1 on Drupal 7 beta1 and created a webform that contains a 'file' component.
Whenever I leave the file field blank and submit the form, I get the following error:

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'data' cannot be null: INSERT INTO {webform_submitted_data} (nid, sid, cid, no, data) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4); Array ( [:db_insert_placeholder_0] => 3 [:db_insert_placeholder_1] => 15 [:db_insert_placeholder_2] => 12 [:db_insert_placeholder_3] => _old [:db_insert_placeholder_4] => ) in webform_submission_insert() (line 110 of ...\sites\all\modules\contrib\webform\includes\webform.submissions.inc).

In webform/includes/webform.submissions.inc we have:

function webform_submission_insert($node, $submission) {
  ...
  foreach ($submission->data as $cid => $values) {
    foreach ($values['value'] as $delta => $value) {
      db_insert('webform_submitted_data')
        ->fields(array(
          'nid' => $node->nid,
          'sid' => $submission->sid,
          'cid' => $cid,
          'no' => $delta,
          'data' => is_null($value) ? '' : $value,
        ))
        ->execute();
    }
  }
  ...
}

To fix the problem I changed:

'data' => $value

to:

'data' => is_null($value) ? '' : $value,