chore: Fix error handling in go-core example

[k-yomo]

Description

As of now, s.Initialize() is called inside if err != nil which shouldn't work.
This PR fixes it by adding proper error handling.

Best practice checklist

• I've considered the best practices on where to put your doc and what to put in your doc
• I've deleted and redirected old pages to this one, if any
• I've updated links affected by this change, if any
• I've updated screenshots affected by this change, if any

Questions?

Reach out to Brock, Tore, or Logan on Slack!