Distinguish unset --*-skip settings from set to the empty string
#662
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This prevents the
%builtinwebor%builtinfwskip defaults from overriding a user's explicitly empty--web-skip=or--fw-skip=setting.This is technically a backwards-incompatible change: Any config that explicitly sets
--web-skipor--fw-skipto the empty string but depends on the built-in skip behavior will fail. This is unlikely to affect many (if any) users; compatibility concerns are believed to be far less significant than the potential need to turn off the built-inskip.