MongoDB versions above v3.6 with Mongoose 4.6.8 fail to retrieve list of courses

With

MongoDB v4.0
Mongoose v4.6.8 (package.json specified)

on my development laptop, new courses do not show up on the instructor control panel.

Console errors:

   GET /modules/users/client/instructor/views/instructor/control-panel-overview.client.view.html 200 3.589 ms - -
    GET /api/auth/get-ivle-key 200 3.754 ms - 34
    (node:28793) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 10): MongoError: The 'cursor' option is required, except for aggregate with the explain argument
    GET /api/courses/statistics 400 9.301 ms - 34

The issue is reported in the Mongoose project in https://github.com/Automattic/mongoose/issues/4101

Fixes:

MongoDB version must be kept at v3.4 OR
Mongoose version must be upgraded to ^4.13.7

I have tested Mongoose 4.13.7 and the issue is resolved with that version. To allow possibility of MongoDB upgrades, we could upgrade to mongoose": ^4.13.7 from mongoose": "~4.6.8 in package.json.

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