Solution module for problem 37 does not import PyPE.exceptions, though it as a raise exc.PyPEException call

[Scott Armitage]

The solution module for problem 37 (PyPE.solutions.pype_037) does not import PyPE.exceptions as exc, however later in the module, there is a call to raise exc.PyPEException. If this exception is ever encountered, we will actually get a Python reference error instead.