Build out sanitizeInput.js

[kennyctran]

The function sanitizeInput.js needs to be built out to protect from XSS attacks prior to the information is added to the database. The client should be able to pull from the database with full confidence that the input is escaped and sanitized.

If the the body received in the function is an empty string OR after sanitizing is an empty string, throw an error and do not add it to the database.