Frequent PHP notices in Drupal views containing states and provinces

A large number PHP Notices are issued when using Drupal views of CiviCRM contacts including State/Provinces as fields and filters. The worst offender is a line in the filter code that concatenates a value to an uninitialized array index.

I am not sure if there is a better approach so I have attached my fix as a patch rather than as a pull request. Let me know if you agree with this change.