Fix NPE in Pig's widerow mode.
Patch by Sheetal Gorsani and Jeremy Hanna, reviewed by brandonwilliams
for CASSANDRA-5488
Merge branch 'cassandra-1.1' into cassandra-1.2

Conflicts:
	CHANGES.txt
Merge branch 'cassandra-1.2' into trunk

Conflicts:
	src/java/org/apache/cassandra/hadoop/pig/CassandraStorage.java