Error due to theme_file_upload_help() and empty extensions not handled

First many thanks for this module that was more than useful to me.
When I tried to use it, I got the error :

Notice : Undefined offset: 0 dans theme_file_upload_help() (ligne 930 de /var/www/html/espace_client_v3/modules/file/file.field.inc).

This is because the case of an empty array for $upload_validators['file_validate_extensions'] is not handled.

As I didn't want to modify Drupal core's code for maintainabilty reasons (would be lost when I update Drupal core), I fixed it by adding the following to your module :

function allow_all_file_extensions_theme_registry_alter(&$theme_registry) {
  if(isset($theme_registry['file_upload_help']))
  {
	$theme_registry['file_upload_help']['preprocess functions'] = array('theme_file_upload_help_preprocess');
  }
}

function theme_file_upload_help_preprocess(&$variables) {
  if (isset($variables['upload_validators']['file_validate_extensions'])) {
    if(empty($variables['upload_validators']['file_validate_extensions'])){
	  unset($variables['upload_validators']['file_validate_extensions']);
	}
  }
}

The result is that the help line Allowed extensions is not displayed.

I'm sorry I'm not at all familiar with patching (I've just created a Drupal account to let you know about it) so I give you my fix and if you like it you can patch your module.

Thanks again
-David