Continue to Address Outage Issues

[raclim]

Progress towards #3096

Changes:

• In server/models/user.js, if the user object doesn't have a password property, thecomparePassword() method will return a boolean value and console logs error instead of throwing it. This is probably a temporary solution—currently I'm testing if this will remove the errors popping up. Why this is being called initially still needs to be identified.
• Optional chaining operators are added to objects in the server/controllers/aws.controller.js to address errors where properties are undefined.
• More defined status codes are added togetSession() in server/controllers/session.controller.js to hopefully remove 404 errors every time a user without an account is on the platform. 200 is sent only when there is a user without an account, which should prevent authenticateUser() from being called. There's probably a better way to do this, but seeing if this will work for now.
• validateSession() in client/modules/User/actions.js is also refactored to use async/await syntax

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123

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