Bad SQL generated for Oracle and empty IEnumerable

Dapper generates SQL for Oracle when passing empty IEnumerables to an IN() clause:

var param = new List<string>();
param.Add("PS"); // Add one or more entries
var bar = Database.Query<mytable>(ConnectInfo,
    @"SELECT * FROM mytable WHERE myvarchar2 IN :param", new {param});

...executes without issue, but:

var param = new List<string>();
// param.Add("PS");
var bar = Database.Query<mytable>(ConnectInfo,
    @"SELECT * FROM mytable WHERE myvarchar2 IN :param", new {param});

Fails with: ORA-00923: FROM keyword not found where expected

See my SO question for more details:
http://stackoverflow.com/questions/26877297/dapper-sql-generation-bug-oracle-and-the-sqls-in-clause

The issue names no repository file or test. Start by reproducing the two Dapper queries with Oracle, then trace how an empty IEnumerable is expanded for the IN clause. Done means the empty-parameter case no longer produces ORA-00923 and the behavior is covered by a test.