Invalid scipy_proc.json does not raise an invalid json error

[mpacer]

If you write an invalid json file, it should raise an error when it is read in.

Currently if you include an invalid json file, e.g.:

{
  "proceedings": {
     "citation_key": "proc-scipy-2017",
     "title": {
       "acronym": "SciPy",
       "conference": "Python in Science Conference",
       "ordinal": "15th",
       "short": "PROC. OF THE 15th PYTHON IN SCIENCE CONF. (SCIPY 2017)",
       "full": "Proceedings of the 15th Python in Science Conference"
     },
     "year": "2017",
     "editor": [
        "Katy Huff",
        "David Lippa",
        "Dillon Niederhut",
        "M Pacer"
     ],
     "volume": 3,
     "number": 1,
     "isbn": "value",
     "location": "Austin, Texas",
     "dates": "July 10 - July 16",
     "copyright": {
       "article": "This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.",
       "proceedings": ["The articles in the Proceedings of the Python in Science Conference are copyrighted and owned by their original authors",
                       "This is an open-access publication and is distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.",
                       "For more information, please see:  http://creativecommons.org/licenses/by/3.0/"],
       "license": "Creative Commons Attribution License (CCAL)"}
  },
  "organization": [

        {
            "name": "Proceedings",
            "members": [
                {"name": "Katy Huff",
                 "org": "University of Illinois"},
                {"name": "David Lippa",
                 "org": "Amazon"},
                {"name": "Dillon Niederhut",
                 "org": "Enthought"},
                {"name": "M Pacer",
                 "org": "Berkeley Institute of Data Science"}
                ]
        },
            "name": "Proceedings Reviewers",
            "members": [
                {"name" : "David Lippa"},
                {"name" : "Katy Huff"},
                {"name" : "M Pacer"},
                {"name" : "Dillon Niederhut"},
                ]
        }
    ]

}

(note the absence of an opening { before the element "name": Proceedings Reviewers", )

then running any of the make commands raises an error that has nothing to do with reading the json in. It just raises an error that the top level key that is being looked for (whether it's proceedings or organization respectively for make proceedings & make organization-pdf). That suggests that the conf is being loaded but not being checked to see if it is valid (or that's being caught and not raised).

[rowanc1]

This should be fixed by #1016 when merged.