print out which container didn't have all it's files added

ui/fixtures/cmd.container.json

@@ -15,7 +15,7 @@
 {
 	"title": "import partial container",
 	"cmd": [ "container", "somedir.torrent" ],
-	"stderr": "Warning, incomple/invalid files, not added:\n\t'filea.txt'\n\t'filec.txt'\n\t'filee.txt'\n"
+	"stderr": "Warning, incomple/invalid files, not added for 'somedir.torrent':\n\t'filea.txt'\n\t'filec.txt'\n\t'filee.txt'\n"
 },
 {
         "special": "verify store object cnt",

ui/medashare/cli.py

@@ -951,7 +951,7 @@ def cmd_container(options):
 		good, bad = validate_file(i)
 
 		if bad:
-			print('Warning, incomple/invalid files, not added:',
+			print('Warning, incomple/invalid files, not added for %s:' % repr(i),
 			    file=sys.stderr)
 			print('\n'.join('\t%s' %
 			    repr(str(pathlib.Path(*x.parts[1:]))) for x in