Release lock when setupCurrentSkin raises.

product/CMFActivity/ActivityTool.py

@@ -895,14 +895,13 @@ class ActivityTool (Folder, UniqueObject):
         acquired = timerservice_lock.acquire(0)
         if not acquired:
           return
-
+        try:
           # make sure our skin is set-up. On CMF 1.5 it's setup by acquisition,
           # but on 2.2 it's by traversal, and our site probably wasn't traversed
           # by the timerserver request, which goes into the Zope Control_Panel
           # calling it a second time is a harmless and cheap no-op.
           # both setupCurrentSkin and REQUEST are acquired from containers.
           self.setupCurrentSkin(self.REQUEST)
-        try:
           old_sm = getSecurityManager()
           try:
             try: