Fix AttributeError exception in autoscaling

Use the nested() method instead of directly accessing the _nested
attribute which isn't always initialized.

Fixes bug #1220737
Change-Id: I9f36d98e91d5175b354e423d7159e690b1e5b696

diff --git a/heat/engine/resources/autoscaling.py b/heat/engine/resources/autoscaling.py
index 12f791270fb49e71bc500cd061243b39e2b5061c..68eaeb3a65fd17ee8e71c0103046f96794bda8ac 100644 (file)
--- a/heat/engine/resources/autoscaling.py
+++ b/heat/engine/resources/autoscaling.py
@@ -258,7 +258,7 @@ class InstanceGroup(stack_resource.StackResource):
         '''
         if name == 'InstanceList':
             ips = [inst.FnGetAtt('PublicIp')
-                   for inst in self._nested.resources.values()]
+                   for inst in self.nested().resources.values()]
             if ips:
                 return unicode(','.join(ips))