Null CIVICRM_PROVINCE_LIMIT causes fatal error in CiviContribute Page

If your CIVICRM_PROVINCE_LIMIT setting is '' (null) - and you try and load a CiviContribute page (contribute/transact?id=1&reset=1) - you get the following fatal SQL error due to empty value in IN () clause. Need to bypass that filter for this config case.

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Sorry. A non-recoverable error has occurred.
Database Error Code: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY name' at line 1, 1064
[message] => DB Error: syntax error
[mode] => 16
[debug_info] => SELECT id, name FROM civicrm_state_province WHERE country_id IN () ORDER BY name [nativecode=1064 ** You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY name' at line 1]