Resolves issue #1819: Return object for GET requests of non existent reviews

[afoote-mitre]

Closes Issue #1819

Summary

GET requests for non existent reviews will now return a 200 with pendingReview set to null, instead of the previous behavior where it 404s.

Important Changes

src/controller/review-object.controller/review-object.controller.js

• Updated response provided by the getReviewObjectByOrgIdentifier() function

src/test/integration-tests/review-object/reviewObjectTest.js

• Updated integration test to now expect the updated response from the GET review call

src/test/unit-tests/review-object/review-object.controller.test.js

• Updated unit tests to now expect the updated response from the GET review call

Testing

Steps to manually test updated functionality, if possible

• 1) Run npm run test:integration and ensure all tests pass
• 2) Run npm run test:unit-tests and ensure all tests pass