[PATCH] Skip NULL arguments when hashing. Hash all arguments.

[Nils Goroll]

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When multiple arguments were passed to vmod_hash_backend, only the
first argument was re-used for the number of arguments passed.

Fixes #1568


Re phk on irc: I don't see how we should handle NULL differntly from "". If no
bytes are processed, the hash does not change.

Nils

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