get rid of "rpmq: no arguments given for query"

(eg: when calling ensure_are_installed with an empty list)

1 files changed, 2 insertions, 0 deletions

diff --git a/perl-install/do_pkgs.pm b/perl-install/do_pkgs.pm
index c98019062..4d1464bc2 100644
--- a/perl-install/do_pkgs.pm
+++ b/perl-install/do_pkgs.pm
@@ -237,6 +237,8 @@ sub is_installed {
 
 sub are_installed {
     my ($_do, @l) = @_;
+    @l or return;
+
     my @l2;
     run_program::run('/bin/rpm', '>', \@l2, '-q', '--qf', "%{name}\n", @l); #- do not care about the return value
     intersection(\@l, [ chomp_(@l2) ]); #- can not return directly @l2 since it contains things like "package xxx is not installed"