def error_handler(self, view):
        self._error_response = view
        return view
Check if a null string default is wrapped as a String trait.
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/flask_wtf/csrf.py/CsrfProtect.error_handler--crossover with--dataset/ETHPy150Open enthought/mayavi/tvtk/tests/test_tvtk.py/TestTVTK.test_null_string_wrapper