current-word without arg may return nil?

[Yoichi NAKAYAMA]

Hello,
If the function `current-word' called without argument,
it may return nil? Its old behavior was to return "" at least.
Following change by rms implies that the above is true:

2003-09-22  Richard M. Stallman  <address@hidden>

        * woman.el (woman-file-name, woman-follow-word):
        If current-word returns nil, use "".

Then, some files still assume the return value is string, e.g.
finder.el (finder-select), man.el (Man-follow-manual-reference)
may cause wrong-type-argument error.

Regards,
-- 
Yoichi NAKAYAMA