[luatex] Crash: type(r) == unset_node

[Akira Kakuto]

> I have no problems on win10, can't test win7 now. 

Here I have no problem also on win7:

This is LuaTeX, Version 0.95.0 (TeX Live 2016/W32TeX) 
restricted system commands enabled.
(./test1.tex
LaTeX2e <2016/03/31> patch level 1
Babel <3.9r> and hyphenation patterns for 1 language(s) loaded.
(c:/usr/local/share/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(c:/usr/local/share/texmf-dist/tex/latex/base/size10.clo)) (./test1.aux)
(./test1.aux))
349 words of node memory still in use:
   2 hlist, 1 vlist, 1 rule, 7 glue, 39 glue_spec, 2 write nodes
   avail lists: 2:12,3:1,4:1,5:3,7:1,8:1,9:1

warning  (pdf backend): no pages of output.
Transcript written on test1.log.

Best,
Akira