bug#17705: [PATCH] lisp/help.el (where-is): don't recreate completing-read's functionality for defaults

[Stefan Monnier <monnier@iro.umontreal.ca>]

> `where-is` was looking for empty string return values from
> `completing-read` and swapping in a default value in that
> case. Updated now to use the default-handling mechanism provided by
> `completing-read`, rather than recreating it.

Thank you, installed.
Note that we now have many small contributions from you, adding up to
a non-trivial amount of code, so we won't be able to accept further
patches from you without some copyright paperwork.
If you intend to submit more patches (which I hope you do), please fill
the form below and send it to the FSF as instructed so they can send you
the appropriate paperwork to sign.


        Stefan


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