Fix build-project-list.pl dieing on repositories with a single commit
Fix build-project-list.pl dieing on repositories with a single commit

Instead of an arrayref containing hashrefs for commits, we get a single
hashref, because there's only one commit :)

perl6/modules.perl6.org,perl6/modules.perl6.org,perl6/modules.perl6.org,perl6/modules.perl6.org