Specify an empty import as ()

[bschmalhofer]

When an empty list is passed to an use statement then the method import() of the module is not called. The empty list can be specified as () or as qw().

$ cat t.pl 
use List::Util;
use List::Util qw();
use List::Util ();

$ perl -MO=Deparse t.pl
use List::Util;
use List::Util ();
use List::Util ();
t.pl syntax OK

() makes a bit more sense as this is the version presented in the documentation of ùse: https://perldoc.perl.org/functions/use . There are also no words to be quoted. So let's standardize on ()` in order to be a bit more consistent. This will also make future tidyings, using the command perlimports, easier. See also https://perladvent.org/2023/2023-12-23.html .

The relavant cases can be found with:
grep -r 'use' | grep 'qw()' | grep -v cpan-lib | tee ../grep.out

[bschmalhofer]

The test suite still looks fine. PR is merged. Closing this issue.