#160977693 Admin should not be able to update the status of a non-existent order

[akhilome]

What does this PR do?

handle edge case where Admin is trying to update the status of an order which hasn't been created yet.

Description of Task to be completed?

• write new test case to handle this change
• modify PUT /orders/:id to make tests pass

How should this be manually tested?

Clone the project repo, cd into the project directory

git clone https://github.com/akhilome/fast-food-fast.git && cd fast-food-fast

install dependencies and setup db

rename .env.example to .env and configure appropriately, then run

npm i && npm run setup-testdb && npm run seed-db

• open up postman and sign up for an admin account using the email hovkard@gmail.com
• login to the account to get a valid auth token
• send a PUT request to http://localhost:3000/api/v1/orders/1000 providing a status of complete in the body section.

What are the relevant pivotal tracker stories?

#160977693

[coveralls]

Coverage increased (+0.04%) to 97.782% when pulling f09129e on bg-order-status-160977693 into 3f2223e on develop.