add a patch for package_tar.bbclass

diff --git a/classes/package_tar.bbclass b/classes/package_tar.bbclass
index e5d3f74..35b5143 100644
--- a/classes/package_tar.bbclass
+++ b/classes/package_tar.bbclass
@@ -85,7 +85,7 @@ python do_package_tar () {
         os.chdir(root)
         from glob import glob
         if not glob('*'):
-            bb.note("Not creating empty archive for %s" % (pkg, bb.data.expand('${PV}-${PR}${DISTRO_PR}', d, True)))
+            bb.note("Not creating empty archive for %s-%s" % (pkg,bb.data.expand('${PV}-${PR}${DISTRO_PR}',d, True)))
             continue
         ret = os.system("tar -czf %s %s" % (tarfn, '.'))
         if ret != 0: