[pitivi: 10/12] Fix tests/common.py so that I can use trial to run tests again.

[Edward Hervey <edwardrv src gnome org>]

commit 3731a7a1c8332ce8fffc6c82fa8d57ccfe3294a1
Author: Alessandro Decina <alessandro d gmail com>
Date:   Sun Mar 7 13:09:30 2010 +0100

    Fix tests/common.py so that I can use trial to run tests again.

 tests/common.py |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/tests/common.py b/tests/common.py
index 4294734..1598b0d 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -58,16 +58,16 @@ class TestCase(unittest.TestCase):
         del self._tracked
 
     def setUp(self):
-        self._num_failures = len(self._result.failures)
-        self._num_errors = len(self._result.errors)
+        self._num_failures = len(getattr(self._result, 'failures', []))
+        self._num_errors = len(getattr(self._result, 'errors', []))
         if detect_leaks:
             self.gctrack()
 
     def tearDown(self):
         # don't barf gc info all over the console if we have already failed a
         # test case
-        if ((self._num_failures < len(self._result.failures)) or
-            (self._num_errors < len(self._result.errors))):
+        if (self._num_failures < len(getattr(self._result, 'failures', []))
+            or self._num_errors < len(getattr(self._result, 'failures', []))):
             return
         if detect_leaks:
             self.gccollect()