cql3/tuples: Don't catch polymorphic exception by value
cql3/tuples: Don't catch polymorphic exception by value

Signed-off-by: Duarte Nunes <a60e8b7496f7715d71354fe4c06dd24017025bf1@scylladb.com>
Message-Id: <20170726155740.3275-1-a60e8b7496f7715d71354fe4c06dd24017025bf1@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,duarten/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla,duarten/scylla