test_decimal_casting.py has invalid test vector under "pairwise" exploration strategy

==================================== ERRORS ====================================
_____________ ERROR collecting query_test/test_decimal_casting.py ______________
conftest.py:157: in pytest_generate_tests
    metafunc.config.option.exploration_strategy)
common/test_vector.py:116: in generate_test_vectors
    return self.__generate_pairwise_combinations()
common/test_vector.py:133: in __generate_pairwise_combinations
    filter_func = self.is_valid)]
../infra/python/env/local/lib/python2.7/site-packages/metacomm/combinatorics/all_pairs2.py:36: in __init__
    raise Exception("option arrays must have at least one item")
E   Exception: option arrays must have at least one item
 generated xml file: /home/ubuntu/Impala/logs/ee_tests/results/TEST-impala-serial.xml