… failing in

some cases.

Changes:
  - Reverted to replacing customised plans() method on Org model with
the native plans() method.
- Created a new org_admin_plans() method in Org model to replace old
customised plans() for Org Admins. This picks up plans of users in Org
that are co-owners of plans with plan.org_id of a different org.
- Fixed a null pointer bug that broke the json output ig the Data contact was empty app/views/api/v0/plans/index.json.jbuilder.
- Renamed method calls in case of Org Admins that used org.plans() to org.org_admin_plans().
- The Plan model scope :organisationally_or_publicly_visible uses the
or_admin_plans() method.
- The tests org_spec.rb and plan_spec.rb updated to reflect changed
output from new native org.plans() method customised
org.org_admin_plans().

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