Don't show the repo display when the merge list is empty.

svn path=/main/trunk/; revision=11660
diff --git a/pym/_emerge/__init__.py b/pym/_emerge/__init__.py
index 24dc51b..29c7199 100644
--- a/pym/_emerge/__init__.py
+++ b/pym/_emerge/__init__.py
@@ -7471,7 +7471,7 @@
 							p.append(colorize("WARN", "    then resume the merge."))
 
 		out = sys.stdout
-		show_repos = repoadd_set != set(["0"])
+		show_repos = repoadd_set and repoadd_set != set(["0"])
 
 		for x in p:
 			if isinstance(x, basestring):