Fix notify.py if we don't have the python module

Change-Id: Idefc91d72346e6e39c3218a7812441f7de0f3f61
diff --git a/tools/notify.py b/tools/notify.py
index f6db21b..b195357 100644
--- a/tools/notify.py
+++ b/tools/notify.py
@@ -15,6 +15,6 @@
     except:
       return
 
-except ImportError:
+except (ImportError, ValueError):
   def notify(message):
     return