basedir spec

[Jaap Karssenberg]

Quoting the basedir spec:
" If $XDG_DATA_DIRS is either not set or empty, a value equal to
/usr/local/share/:/usr/share/ should be used. "

The phrasing "not set or empty" is used for all the defaults. I think
this should be just "not set". Because I want to be able to turn off the
defaults (for example for testing purposes); to set the var to an empty
string seems the logical way to do this.

Thus I propose:
    when var is not set the defaults are used
    when var set but empty, use empty var

-- 
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