Bug 21005: Missing row/column defaults cause unexpected results in report wizards

Bug 21005: Missing row/column defaults cause unexpected results in report wizards

Some report wizards are missing row/column defaults, which sometimes return blank
pages (borrowers_stats.pl) or results always equalling 0, which a non-discerning
user may interpret incorrectly.

If the DEBUG environmental variable is enabled, missing row/column choices will
actually cause fatal software errors as well, which is also undesirable for users.

This patch adds default choices for row and column on
report wizards that had no radio buttons selected, so that a user
can't submit the form without choosing a row and column. This
prevents errors.

To test:
1) Apply patch
2) Visit /cgi-bin/koha/reports/issues_avg_stats.pl
3) Visit /cgi-bin/koha/reports/borrowers_stats.pl
4) Visit /cgi-bin/koha/reports/catalogue_stats.pl
5) Visit /cgi-bin/koha/reports/issues_stats.pl
6) Observe that default choices for row/column are there

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>