def extendheader(table, fields):

    return ExtendHeaderView(table, fields)
Ensure that non_field_errors are displayed correctly, including the
dataset/ETHPy150Open alimanfoo/petl/petl/transform/headers.py/extendheader--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/tests/regressiontests/admin_inlines/tests.py/TestInline.test_tabular_non_field_errors