REPP character positions don't consider empty replacements

[goodmami]

PyDelphin gives the same output as the standalone REPP tool for most inputs but it still has a bug or two. See the following output of PyDelphin:

$ delphin repp -c ~/grammars/erg-trunk/pet/repp.set --format triple <<< "Abrams <s>won't</s> go."
(0, 6, Abrams)
(7, 9, wo)
(9, 12, n’t)
(13, 15, go)
(15, 16, .)

Compared to REPP:

$ ~/logon/bin/repp -c ~/grammars/erg-trunk/pet/repp.set --format triple <<< "Abrams <s>won't</s> go."
(0, 6, Abrams)
(10, 12, wo)
(12, 15, n’t)
(20, 22, go)
(22, 23, .)

ACE gets it right (note, the sed commands are a useful way to convert ACE's output to match REPP's):

$ ace -g erg.dat -Ev <<< "Abrams <s>won't</s> go." 2>/dev/null | \
  sed -r -e '/^(NOTE|ERROR|SENT|SKIP): /d' -e 's/([^ ]+)<([0-9]+):([0-9]+)>( |$)/(\2, \3, \1)\n/g' | \
  sed '/^$/N;/^\n$/D'
(0, 6, Abrams)
(10, 12, wo)
(12, 15, n’t)
(20, 22, go)
(22, 23, .)

This seems to be an issue with discarded matches; i.e., where nothing is inserted in the replacement.