Bug #7612 MySqlDataReader.GetString(index) returns non-Null value when field is Null

Description:
MySqlDataReader.GetString(index) returns non-Null value when the field is Null.  I have a resultset being generated from a SELECT statement that returns a String field that is defined as NULLABLE.  Row 3 in the resultset has a non-NULL value in the field.  Every consectutive row in the resultset after row 3 that has a NULL value for the field in the database returns the non-NULL value (from row 3) instead of a NULL.  The IsDBNull method correctly returns TRUE for the fields that should be NULL even though the GetString method returns a non-NULL value.  The SELECT statement generates the correct output when run from the MySql Command Line Client.

How to repeat:
Generate a resultset from a table with a NULLABLE VARCHAR column with a row with a non-NULL value and a subsequent row with a NULL value.  The MySqlDataReader.GetString will return the non-NULL value for NULL value row.

Suggested fix:
Have the GetString return a NULL value.

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