fix(fill_db_data.py): ignore exception in truncate tables
fix(fill_db_data.py): ignore exception in truncate tables

The exception in truncate tables will break the subtest, the test data
won't be prepared, next verify test will fail.

Signed-off-by: Amos Kong <eb01d8f828a6c9a20be4534e72e049aaf41503df@scylladb.com>

scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests