[9.0][ADD] purchase_double_validation: Migration scripts

[pedrobaeza]

@Tecnativa TT20683

[StefanRijnhart]

Unexpected travis error

File "/home/travis/build/OCA/OpenUpgrade/addons/purchase/migrations/9.0.1.2/post-migration.py", line 303, in migrate_purchase_double_validation

    words = env.ref('purchase.trans_confirmed_double_gt').condition.split()

  File "/home/travis/build/OCA/OpenUpgrade/openerp/api.py", line 792, in ref

    return self['ir.model.data'].xmlid_to_object(xml_id, raise_if_not_found=raise_if_not_found)

  File "/home/travis/build/OCA/OpenUpgrade/openerp/api.py", line 248, in wrapper

    return new_api(self, *args, **kwargs)

  File "/home/travis/build/OCA/OpenUpgrade/openerp/api.py", line 490, in new_api

    result = method(self._model, cr, uid, *args, **old_kwargs)

  File "/home/travis/build/OCA/OpenUpgrade/openerp/addons/base/ir/ir_model.py", line 1049, in xmlid_to_object

    raise ValueError('No record found for unique ID %s. It may have been deleted.' % (xmlid))

ValueError: No record found for unique ID purchase.trans_confirmed_double_gt. It may have been deleted.

[pedrobaeza]

Fixed. Workflow is being deleted before, so I need to take the value on pre before this removal.

[StefanRijnhart]

Thanks for the update!

[StefanRijnhart]

/ocabot merge

[OCA-git-bot]

This PR looks fantastic, let's merge it!
Prepared branch 9.0-ocabot-merge-pr-2137-by-StefanRijnhart-bump-no, awaiting test results.

[OCA-git-bot]

Congratulations, your PR was merged at bef5441. Thanks a lot for contributing to OCA. ❤️