Fix a case of unintended hyphenation
When we take a complete item because there are no breakpoints, we were inserting a hyphen at the end even though there may not be a breakpoint there, and ending up with a hyphen in the middle of an (overlong) line: Brat-wurst.
Test included.
This but was discovered with the help of http://gitlab.gnome.org/matthiasc/layout-editor