* fix: add error handling to avoid ghost plugins
Add null checks to filter out incomplete plugin metadata objects that would appear as ghost plugins in the API response.
This fix ensures that plugins with all null key fields (name, author, desc, version, display_name) are not included in the plugin list response, preventing ghost plugins from appearing in the UI.
Issue: #4833
* fix: improve ghost plugin detection logic for better accuracy
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Co-authored-by: Soulter <905617992@qq.com>
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