Add nil check for Burner

[joshuahannan]

Description

Add check to see if AnyResource is nil before burning it with the Burner

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For contributor use:

• Targeted PR against v2-standard branch
• Re-reviewed Files changed in the Github PR explorer
• Added appropriate labels

[sisyphusSmiling]

Looks good. Only note is unrelated - looks like the repo isn't configured for codecov which is an option now that we have Cadence tests. I can get that setup if you like, just lmk

[austinkline]

Looks good! This unfortunately won't handle cases where we have ?? or greater values but that might be better addressed by the cadence team

[joshuahannan]

I think this is fine for now. If we see that double optionals are causing problems in the future, then we can revisit