Always call release before thread exits.

product/ERP5Type/tests/ERP5TypeTestSuite.py

@@ -120,6 +120,7 @@ class TestSuite(object):
     assert test not in self.running
     self.running[test] = instance = self._pool.pop(0)
     def run():
+      try:
         self._instance.id = instance
         if instance not in self._ready:
           self._ready.add(instance)
@@ -128,6 +129,7 @@ class TestSuite(object):
         if on_stop is not None:
           on_stop(status_dict)
         self._pool.append(self.running.pop(test))
+      finally:
         self.release()
     thread = threading.Thread(target=run)
     thread.setDaemon(True)