Resolves #1739 and #1740, getOrg() Error Handling and Documentation

[afoote-mitre]

Closes Issue #1739 and #1740

Summary

Updated the getOrg() error handling to properly separate errors thrown by the repository, from errors through by mongo, and errors thrown when no results are found. Updated inline comments to properly reflect what each case handles.

Important Changes

src/controller/org.controller/org.controller.js

• Added new error handling for different errors
• Clarified accompanying documentation

Testing

Steps to manually test updated functionality, if possible

• 1) Search for an org that doesn't exist
• 2) Verify that a 404 returns as expected
• 3) Stop local mongo instance
• 4) Search for an org
• 5) Verify that a 500 returns as expected