[PATCH] Name parser throws exception if author name consists of a single word

I have several instances of author names that consist of only a single word in the Bibtex import.
For example:

...
author = {Elliot, David J and Suharjono and Lewis, Benjamin C and Gillam, Elizabeth M J and Birkett, Donald J and Gross, Annette S and Miners, John O},
...

The second author name "Suharjono" causes an exception to be thrown which results in an empty entry in the table biblio_contributor_data

+------+-----+----------+------------+-----------+----------+-----------+--------+--------+----------+-------------+---------+------+
| cid  | aka | alt_form | drupal_uid | name      | lastname | firstname | prefix | suffix | initials | affiliation | literal | md5  |
+------+-----+----------+------------+-----------+----------+-----------+--------+--------+----------+-------------+---------+------+
| 2037 |   0 |        0 |       NULL | Suharjono |          |           |        |        |          |             |       0 | NULL |
+------+-----+----------+------------+-----------+----------+-----------+--------+--------+----------+-------------+---------+------+
1 row in set (0.01 sec)

I will post a patch that addresses this problem.