fix: missing emojis in meta.json interrupts emoji import

[winrg]

💡 Summary

if a meta.json file in an emoji zip references a file not present in the zip, the import process will log an error and exit, interrupting the import

🥰 Expected Behavior

the remaining emojis should be imported without error

🤬 Actual Behavior

only the emojis up to the missing one are imported

📝 Steps to Reproduce

No response

💻 Frontend Environment

No response

🛰 Backend Environment (for server admin)

* Misskey: all versions back to at least commit b75184e

Do you want to address this bug yourself?

• [X] Yes, I will patch the bug myself and send a pull request

[winrg]

submitted pr #14461