importexportapi_csv_get_parsed() breaks with empty $enclosure string.

In trying to call importexportapi_csv_get_parsed() directly, over-riding the delimiter and enclosure strings, it seems that an empty enclosure (common in tab-delimited files), breaks the regex.

FWIW, my (simple) solution was to make my tab-delimited file look like a comma-separated with quote enclosures.

  $contents = str_replace("\r\n", "\n", $contents);
  $contents = str_replace("\n\r", "\n", $contents);
  $contents = str_replace("\r", "\n", $contents);
  $contents = "\"". str_replace("\n", "\"\n\"", str_replace("\t", "\",\"", $contents)) . "\"";
  $result = importexportapi_csv_get_parsed($contents);