Comment 3 for bug 1479579

Reviewed: https://review.openstack.org/216481
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=e889d66e07183d34849273ae68dc096c0616fa21
Submitter: Jenkins
Branch: stable/kilo

commit e889d66e07183d34849273ae68dc096c0616fa21
Author: Steve Baker <email address hidden>
Date: Tue Aug 25 13:38:07 2015 +1200

    Don't raise exception when get nested stack

    1. Stack.load() won't return None, instead will raise
    notFound exception if we can't get the stack from db.
    So we should catch the notFound exception in
    StackResource.nested() when loading.
    2. Return None if we catch the notFound when get the
    nested, due there are many places where we call the
    nested(), and raise the notFound exception makes no sense.

    (cherry-picked from b101190f3261535daf5848a5a77e8902f3a7a4a1)
    Closes-Bug: #1479579
    Change-Id: I2540ca13572dfe628e6fc596815bee427b41290f