TypeError: Cannot read property '*' of undefined

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

I just upgrade to parse-server 4.5.0 and I'm getting the error below (in the logs section).

I'm running this using docker-compose, the parse container keeps restarting a couple of times with this error, then seems to be working fine. I checked the changelog and specifically #6465 but that doesn't seem to be it, since I'm running parse-server 4.5.0 and mongodb 4.4.6.

Steps to reproduce

Not sure how to reproduce this, because I'm pretty sure not everyone using parse-server 4.5.0 has this issue.

Actual Outcome

Server keeps restarting.

Expected Outcome

Server starts up successfully first time I start it.

Failing Test Case / Pull Request

• 🤩 I submitted a PR with a fix and a test case.
• 🧐 I submitted a PR with a failing test case.

Environment

Server

• Parse Server version: 4.5.0
• Operating system: Ubuntu 20.04 LTS
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): Digital Ocean

Database

• System (MongoDB or Postgres): MongoDB
• Database version: 4.4.6
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): MongoDB Atlas

Client (irrelevant as server doesn't start up)

• SDK (iOS, Android, JavaScript, PHP, Unity, etc): FILL_THIS_OUT
• SDK version: FILL_THIS_OUT

Logs

warn: Unable to ensure uniqueness for usernames:  Cannot read property '*' of undefined {"stack":"TypeError: Cannot read property '*' of undefined\n    at SchemaData.get (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:671:84)\n    at SchemaController.enforceClassExists (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:1013:24)\n    at /app/node_modules/parse-server/lib/Controllers/DatabaseController.js:1432:70\n    at processTicksAndRejections (internal/process/task_queues.js:93:5)"}
warn: Unable to create case insensitive username index:  Cannot read property '*' of undefined {"stack":"TypeError: Cannot read property '*' of undefined\n    at SchemaData.get (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:671:84)\n    at SchemaController.enforceClassExists (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:1013:24)\n    at /app/node_modules/parse-server/lib/Controllers/DatabaseController.js:1432:70\n    at processTicksAndRejections (internal/process/task_queues.js:93:5)"}
warn: Unable to ensure uniqueness for user email addresses:  Cannot read property '*' of undefined {"stack":"TypeError: Cannot read property '*' of undefined\n    at SchemaData.get (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:671:84)\n    at SchemaController.enforceClassExists (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:1013:24)\n    at /app/node_modules/parse-server/lib/Controllers/DatabaseController.js:1432:70\n    at processTicksAndRejections (internal/process/task_queues.js:93:5)"}
warn: Unable to create case insensitive email index:  Cannot read property '*' of undefined {"stack":"TypeError: Cannot read property '*' of undefined\n    at SchemaData.get (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:671:84)\n    at SchemaController.enforceClassExists (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:1013:24)\n    at /app/node_modules/parse-server/lib/Controllers/DatabaseController.js:1432:70\n    at processTicksAndRejections (internal/process/task_queues.js:93:5)"}
TypeError: Cannot read property '*' of undefined
    at SchemaData.get (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:671:84)
    at SchemaController.enforceClassExists (/app/node_modules/parse-server/lib/Controllers/SchemaController.js:1013:24)
    at /app/node_modules/parse-server/lib/Controllers/DatabaseController.js:1432:70
    at processTicksAndRejections (internal/process/task_queues.js:93:5)

Start by inspecting SchemaController.js at SchemaData.get and SchemaController.enforceClassExists, then trace the call from DatabaseController.js:1432. Reproduce the Parse Server 4.5.0 startup with Docker Compose, MongoDB 4.4.6, and the reported environment; done means the server starts successfully without the TypeError warnings.