fix(gnovm): m.Panic for nil deref

[ltzmaxwell]

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[Gno2D2]

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[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/pkg/gnolang/machine.go	60.00%	2 Missing ⚠️

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[Villaquiranm]

Shouldn't this check be over pv
like:
if pv.Base == nil { ?

[ltzmaxwell]

thank you for reviewing this, i believe the previous intelligence will ensure pv is mutable here, so pv.Base will not be nil.