Allow deleting org of a running workflow job (#15374)

Old RBAC system hits DOESNOTEXIST query errors
if a user deletes an org while a workflow job is active.

The error is triggered by
1. starting workflow job
2. delete the org that the workflow job is a part of
3. The workflow changes status (e.g. pending to waiting)

This error message would surface
awx.main.models.rbac.Role.DoesNotExist: Role matching
query does not exist.

The fix is wrap the query in a try catch, and skip
over some logic if the roles don't exist.

---------

Signed-off-by: Seth Foster <fosterbseth@gmail.com>

awx/main/tests/functional/test_rbac_organization.py

@@ -48,3 +48,17 @@ def test_org_resource_role(ext_auth, organization, rando, org_admin):
         assert access.can_attach(organization, rando, 'member_role.members') == ext_auth
         organization.member_role.members.add(rando)
         assert access.can_unattach(organization, rando, 'member_role.members') == ext_auth
+
+
+@pytest.mark.django_db
+def test_delete_org_while_workflow_active(workflow_job_template):
+    '''
+    Delete org while workflow job is active (i.e. changing status)
+    '''
+    assert workflow_job_template.organization  # sanity check
+    wj = workflow_job_template.create_unified_job()  # status should be new
+    workflow_job_template.organization.delete()
+    wj.refresh_from_db()
+    assert wj.status != 'pending'  # sanity check
+    wj.status = 'pending'  # status needs to change in order to trigger workflow_job_template.save()
+    wj.save(update_fields=['status'])