Fatal crash on when parsing/printing this error

[jordwalke]

(This was using refmterr).

I think we could add a giant try/catch around everything and by default just print the output unprettified.

+ env OCAMLOPT="ocamlopt.opt" /Users/user/Sites/project/node_modules/reason/_build/ocamlfind/bin/reopt -I /Users/user/Sites/project/node_modules/easy-format-actual/_build/ocamlfind/lib/easy-format -I /Users/pieterv/Sites/project/node_modules/flow_parser-actual/_build/ocamlfind/lib/flow_parser /Users/pieterv/Sites/project/node_modules/flow_parser-actual/_build/ocamlfind/lib/flow_parser/parser_flow.cmxa /Users/pieterv/Sites/project/node_modules/easy-format-actual/_build/ocamlfind/lib/easy-format/easy_format.cmx src/MiscTools.cmx src/Print.cmx src/project.cmx -o src/project.native
File "_none_", line 1:
Error: No implementations provided for the following modules:
         Unix referenced from src/MiscTools.cmx
Command exited with code 2.
Compilation unsuccessful after building 10 targets (9 cached) in 00:00:00.