dylan-lang/opendylan — pull request #230 by hannesm (2012-07-17 22:39:34+00:00)
Title: condition-to-string should never return #f.

It was handled gracefully in print-pretty-name, but not in
default-last-handler, which then tried to concatenate(#f, "\n") and
failed.

I rather changed the GF to return always a and the default
implementation on returns the string which was used in
print-pretty-name.