A missing stanza in the configuration JSON file will cause a KeyError exception

[jeffsilverm]

============================= test session starts ==============================
platform linux -- Python 3.6.7, pytest-3.3.1, py-1.5.2, pluggy-0.6.0
rootdir: /home/jeffs/python/nbmdt/test, inifile:Testing the __file__ special variable: /home/jeffs/python/nbmdt/utilities.py

test_utilities.py:None (test_utilities.py)
test_utilities.py:16: in <module>
    sd_obj = utilities.SystemDescriptionFile( TEST_CONFIGURATION_FILE )
../utilities.py:273: in __init__
    presentations=c_dict["presentations"],
E   KeyError: 'presentations'
collected 0 items / 1 errors
==================================== ERRORS ====================================
______________________ ERROR collecting test_utilities.py ______________________
test_utilities.py:16: in <module>
    sd_obj = utilities.SystemDescriptionFile( TEST_CONFIGURATION_FILE )
../utilities.py:273: in __init__
    presentations=c_dict["presentations"],
E   KeyError: 'presentations'
------------------------------- Captured stderr --------------------------------
Testing the __file__ special variable: /home/jeffs/python/nbmdt/utilities.py
!!!!!!!!!!!!!!!!!!! Interrupted: 1 errors during collection !!!!!!!!!!!!!!!!!!!!

Before closing this issue, verify that both python and pytest can detect the problem and deal with it safely.