Flexinode module tries to insert a blank string ('') in an integer column in PostgreSQL

Drupal flexinode module attempts to insert a blank string ('') in when the input is not specified for an integer column. MySQL allows this but PostgreSQL does not. This results in a DB error.

This problem was found in 4.6.0 version of the module with Drupal 4.6.6.

See http://drupal.org/node/60894 for a similar bug in Drupal core modules.