only pass arch to binary_to_source if it has length

diff --git a/Debbugs/Packages.pm b/Debbugs/Packages.pm
index 88dc8b47a859dd081b62487e787cea7b580814c6..482938da9310a672ddf36dc37fce57768789f64f 100644 (file)
--- a/Debbugs/Packages.pm
+++ b/Debbugs/Packages.pm
@@ -611,7 +611,7 @@ sub make_source_versions {
                    }
                    my @srcinfo = binary_to_source(binary => $pkg,
                                                   version => $version,
-                                                  arch    => $arch);
+                                                  length($arch)?(arch    => $arch):());
                    if (not @srcinfo) {
                        # We don't have explicit information about the
                        # binary-to-source mapping for this version