[storm] Cache for nonexistent result

[Ivan Zakrevskyi]

You are right, @Free. It's not serializable, but it's not 100% safe for
repeatable read (repeatable level can lock only existent row). So, minimal
100% safe level is serializable.

I agree, that best place for nonexistent_cache is application extension,
not library, because it can't be 100% safe for repeatable read.
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