[Rd] Code demos via HTML help gives an error

[Henrik Bengtsson]

PROBLEM:
I'm getting error:

Error in order(matches$Position) : argument 1 is not a vector

Whenever I try to access a package's "Code demos" page via the link on
the package HTML index page.


SOME TROUBLESHOOTING:
Looking at for instance the 'stats' package.  The "Code demos" URL
takes the form

 http://127.0.0.1:30200/library/stats/demo

Click on this, takes me to

 http://127.0.0.1:30200/doc/html/Search?package=stats&agrep=FALSE&types=demo


WHERE:
I see this on R devel (2015-06-15 r68521) and R 3.2.1 RC (2015-06-14
r68516) - both on Platform: x86_64-w64-mingw32/x64 (64-bit).  Haven't
checked other platforms.


Regarding the imminent release of R 3.2.1; Sorry, I rarely use demos,
so it's only in this very moment I noticed.

/Henrik