Use :none category to replace nil category
What does this MR do and why?
Following up from !185 (merged)
Use :none category to replace nil category. Moving forward, category should never be nil.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Closes #54 (closed)
Edited by Lin Jen-Shin