feat : if slug is empty, use id

[guesung]

Description

What I Did

• Identified an issue where the slug value was empty in certain blog posts.
• Implemented a fallback mechanism where, if the slug is missing, the post's ID is used instead.

Proposal

• Problem: The current implementation of the blog relies heavily on slug values for operations. However, in cases where the slug is absent, this could lead to unforeseen errors or dysfunctional behavior.
• Solution: My proposal is to modify the logic so that in the absence of a slug value, the system gracefully falls back to using the post's unique ID. This ensures continuity of functionality and enhances the robustness of the system.

Related tickets

https://github.com/morethanmin/morethan-log/issues/XX

PR Checklist

• I have read the Contributing Guide
• I have written documents and tests, if needed.

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Name	Status	Preview	Comments	Updated (UTC)
morethan-log	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 1, 2024 1:56pm

[morethanmin]

Thank you for submitting the pull request! 😄

I have some concerns about modifying data in the filterPosts function. It would be preferable to set a fallback for the slug in the getPosts function instead.