chore: delete queue files if serialization fails

[marandaneto]

💡 Motivation and Context

Closes #231

💚 How did you test it?

I cannot reproduce this issue.
I cannot mock the serializer right now, since the catch block already deletes the file, I just did the same if the serializer returns null.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

[ioannisj]

LG.