Benedict Elliot Smith as a follow up cassandra_src all time

f7856c225857e8bb975289f46e2b9b001888ea0c | Author: Tyler Hobbs <tylerhobbs@apache.org>
 | 2015-03-27 10:00:37-05:00

    Clearer logic for first index summary entry in builder
    
    Patch by Tyler Hobbs; reviewed by Benedict Elliot Smith as a follow up for
    CASSANDRA-8993