Adjust DECODE-URL to give back NONE hosts
Adjust DECODE-URL to give back NONE hosts

This gives back a NONE! host for an empty string instead of just
continuing with the empty string.  (See notes on why the code was
changed in Ren-C from R3-Alpha regarding the handling of TUPLE! in
a previous commit.)

hostilefork/rebol,kealist/ren-c,rgchris/ren-c,draegtun/ren-c,draegtun/ren-c,hostilefork/rebol,hostilefork/rebol,draegtun/ren-c,hostilefork/rebol,rgchris/ren-c,rgchris/ren-c,draegtun/ren-c,giuliolunati/ren-c,giuliolunati/ren-c,giuliolunati/ren-c,rgchris/ren-c,codebybrett/ren-c,codebybrett/ren-c,codebybrett/ren-c,draegtun/ren-c,kealist/ren-c,giuliolunati/ren-c,kealist/ren-c,codebybrett/ren-c,hostilefork/rebol,rgchris/ren-c,kealist/ren-c,codebybrett/ren-c,giuliolunati/ren-c,hostilefork/rebol,draegtun/ren-c,kealist/ren-c,kealist/ren-c,codebybrett/ren-c