Fix crash when stat'ing objects with non-ascii names

This patch fixes a crash and stack trace in stat when an object
name contains non-ascii characters.

Change-Id: Ib6dc686771e593243de56cafc100b17e51d9d9d5
Closes-Bug: 1411665

swiftclient/multithreading.py

@@ -84,13 +84,11 @@ class OutputManager(object):
         self.print_pool.submit(self._print, msg)
 
     def print_items(self, items, offset=DEFAULT_OFFSET, skip_missing=False):
-        lines = []
         template = '%%%ds: %%s' % offset
         for k, v in items:
             if skip_missing and not v:
                 continue
-            lines.append((template % (k, v)).rstrip())
-        self.print_msg('\n'.join(lines))
+            self.print_msg((template % (k, v)).rstrip())
 
     def error(self, msg, *fmt_args):
         if fmt_args:

tests/unit/test_multithreading.py

@@ -205,6 +205,11 @@ class TestOutputManager(testtools.TestCase):
             thread_manager.print_raw(
                 u'some raw bytes: \u062A\u062A'.encode('utf-8'))
 
+            thread_manager.print_items([
+                ('key', u'value'),
+                ('object', 'O\xcc\x88bject')
+            ])
+
             # Now we have a thread for error printing and a thread for
             # normal print messages
             self.assertEqual(starting_thread_count + 2,
@@ -227,7 +232,10 @@ class TestOutputManager(testtools.TestCase):
         self.assertEqual(''.join([
             'one-argument\n',
             'one fish, 88 fish\n',
-            'some\n', 'where\n', over_the, raw_bytes
+            'some\n', 'where\n',
+            over_the, raw_bytes,
+            '           key: value\n',
+            '        object: O\xcc\x88bject\n'
         ]), out_stream.getvalue())
 
         first_item = u'I have 99 problems, but a \u062A\u062A is not one\n'