- Be explicit on command line checking, instead of relying on patterns,

  which may be NULL (e.g. -e '').
- let add_pattern() decide how to deal with empty patterns, don't do
  magic in read_patterns().

This unbreaks stuff like grep -e '', and makes grep -f <file> more
POSIX compliant. Semantics for grep -f /dev/null (or any other empty
file) may be questionable, but this case isn't specified by POSIX,
and matching nothing at all seems to be sane.

Thanks to otto@, who mentioned potential problems related to the
-x option with the first patch i sent.

ok jaredy@ (some time ago), otto@, millert@

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