fixup! fixup! Zope2: use func_code if __code__ is missing, that is the case for Script (Python).

nexedi/erp5@21f85a6f
added zope2 compatibility, but nexedi/erp5@21f85a6f (comment 180420) noted
the given assumption isn't true, which is why fixup commit nexedi/erp5@7a2c616e was
added. But nexedi/erp5@21f85a6f (comment 184548) noted
that nexedi/erp5@7a2c616e missed one case,
which is why this fixup commit is added. Now everything should be ok.

product/ERP5/Document/Alarm.py

@@ -164,7 +164,7 @@ class Alarm(XMLObject, PeriodicityMixin):
           activate_kw['tag'] = '%s_%x' % (self.getRelativeUrl(), getrandbits(32))
         tag = activate_kw['tag']
         method = getattr(self, method_id)
-        func_code = method.__code__
+        func_code = getattr(method, '__code__', None)
         if func_code is None: # BBB Zope2
           func_code = method.func_code
         try: