fix another place where use warnings complains

diff --git a/bin/wanna-build b/bin/wanna-build
index 56e5ced97a300d4309341e7e1f06b04c4085ba3c..636cdaecca1c7749ca9309007c6f17b621c08271 100755 (executable)
--- a/bin/wanna-build
+++ b/bin/wanna-build
@@ -2676,7 +2676,7 @@ sub call_edos_depcheck {
        my $change = 
            (defined $interesting_packages{$key} and $pkg->{'state'} eq 'Needs-Build') ||
            (not defined $interesting_packages{$key} and $pkg->{'state'} eq 'BD-Uninstallable');
-       my $problemchange = $interesting_packages{$key} ne $pkg->{'bd_problem'};
+       my $problemchange = ($interesting_packages{$key}//"") ne ($pkg->{'bd_problem'}//"");
        if ($change) {
            if (defined $interesting_packages{$key}) {
                    change_state( \$pkg, 'BD-Uninstallable' );