Your bug report

#6679: locate-library does not provide a default when called interactively

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 6679@debbugs.gnu.org.

-- 
6679: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6679
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