Fix flake8

Change-Id: Ia81b37958ab03630cf9f3c65ab1ec59a95f82d68
Signed-off-by: quilesj <e.nvi001.tid@telefonica.com>
diff --git a/n2vc/juju_observer.py b/n2vc/juju_observer.py
index f4102a4..25c1c1f 100644
--- a/n2vc/juju_observer.py
+++ b/n2vc/juju_observer.py
@@ -54,7 +54,7 @@
     def register_machine(self, machine: Machine, db_dict: dict):
         try:
             entity_id = machine.entity_id
-        except:
+        except Exception as e:
             # no entity_id aatribute, try machine attribute
             entity_id = machine.machine
         self.n2vc.debug(msg='Registering machine for changes notifications: {}'.format(entity_id))