Implement Backend Frontend Communication Exception Handling

[WolfgangDaniel]

As a developer, I'd like to know that calls to the backend are being handled properly if they fail, in order to have a product that is robust.

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💭   Hints & Thoughts

❓   Additional Questions to Answer / Consider

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✅   Conditions of satisfaction

• Should figure out what is best practice to handle errors (try catch vs. if error) and commit to one format to handle errors
• Should go through all controller functions on the server side and add an error handling that returns the error code
• Should find all use cases of backend calls in the frontend and make sure that the case of failure is always handled (Socket and REST)