component.assembly_uuid raises an exception when assembly_id is None

[Pierre Padrixe (stannie)]

component.assembly_uuid raises an exception when assembly_id is None.

And when I am doing Component.as_dict with no assembly_id set, it raises a ResourceNotFound: assemblies could not be found.
It shouldn't raise any exception and just retourn the dict without the field.

(Note that assembly_id FK is nullable in Component)

as_dict stacktrace:
  File "solum/objects/sqlalchemy/models.py", line 75, in as_dict
    d[k] = self[k]
  File "solum/openstack/common/db/sqlalchemy/models.py", line 57, in __getitem__
    return getattr(self, key)
  File "solum/objects/sqlalchemy/component.py", line 46, in assembly_uuid
    return objects.registry.Assembly.get_by_id(None, self.assembly_id).uuid
  File "solum/objects/sqlalchemy/models.py", line 92, in get_by_id
    cls._raise_not_found(item_id)
  File "solum/objects/sqlalchemy/models.py", line 148, in _raise_not_found
    raise exception.ResourceNotFound(name=cls.__resource__, id=item_id)
ResourceNotFound: The assemblies resource None could not be found.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/86974

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/86974
Committed: https://git.openstack.org/cgit/stackforge/solum/commit/?id=e2368f5fdbf98420eb820ae09bbcc91fc6a045ab
Submitter: Jenkins
Branch: master

commit e2368f5fdbf98420eb820ae09bbcc91fc6a045ab
Author: Pierre Padrixe <email address hidden>
Date: Mon Apr 14 10:49:32 2014 +0200

    Allow as_dict with no assembly_id FK set in Component

    Component.assembly_uuid used to raise an exception when no assembly_id
    was set. It was an acceptable behavior but when you were calling as_dict
    you were getting a ResourneNotFound and couldn't retrieve your dict.
    The purpose of this patch is to allow the use of as_dict with no assembly
    set as FK.

    Change-Id: I3518e0dfb3f85631260474ba465146314e48a12c
    Closes-Bug: #1306731