Allow git_cl to be called when no default server is given

tests/git_cl_test.py

Index: tests/git_cl_test.py
diff --git a/tests/git_cl_test.py b/tests/git_cl_test.py
index cc01ae3b829da5dbb5a2862a7a10aee44ade7886..9dfbbf43b27bebc956de7dc1f1ba6d350118158d 100755
--- a/tests/git_cl_test.py
+++ b/tests/git_cl_test.py
@@ -1497,14 +1497,8 @@ class TestGitCl(TestCase):
   def test_description_rietveld(self):
     out = StringIO.StringIO()
     self.mock(git_cl.sys, 'stdout', out)
-    self.mock(git_cl.Changelist, 'GetDescription',
-              lambda *args: 'foobar')
+    self.mock(git_cl.Changelist, 'GetDescription', lambda *args: 'foobar')
 
-    self.calls = [
-        ((['git', 'config', 'rietveld.autoupdate'],), ''),
-        ((['git', 'config', 'rietveld.server'],), ''),
-        ((['git', 'config', 'rietveld.server'],), ''),
-    ]
     self.assertEqual(0, git_cl.main([
         'description', 'https://code.review.org/123123', '-d', '--rietveld']))
     self.assertEqual('foobar\n', out.getvalue())
@@ -1512,8 +1506,7 @@ class TestGitCl(TestCase):
   def test_description_gerrit(self):
     out = StringIO.StringIO()
     self.mock(git_cl.sys, 'stdout', out)
-    self.mock(git_cl.Changelist, 'GetDescription',
-              lambda *args: 'foobar')
+    self.mock(git_cl.Changelist, 'GetDescription', lambda *args: 'foobar')
 
     self.assertEqual(0, git_cl.main([
         'description', 'https://code.review.org/123123', '-d', '--gerrit']))