xmlrpclib can not dump defaultdict

From http://www.tryton.org/~irclog/2017-11-15.log.html#t2017-11-15%2020:38
The xmlrpclib can not dump defaultdict, so RPC method like on_change should not return such type.

assigned to @ced

added trytond type::crash + 1 deleted label

added 1 deleted label and removed 1 deleted label

review44431002 updated at https://codereview.tryton.org/44431002/#ps1

New changeset fc4741aadcbd by Cédric Krier in branch 'default':
Do not use defaultdict as changed value
http://hg.tryton.org/trytond/rev/fc4741aadcbd

added 1 deleted label and removed 1 deleted label

closed

New changeset 4395cb214b46 by Cédric Krier in branch '4.6':
Do not use defaultdict as changed value
http://hg.tryton.org/trytond/rev/4395cb214b46

New changeset a3db66afd96e by Cédric Krier in branch '4.4':
Do not use defaultdict as changed value
http://hg.tryton.org/trytond/rev/a3db66afd96e

New changeset d2b5389ad0fc by Cédric Krier in branch '4.2':
Do not use defaultdict as changed value
http://hg.tryton.org/trytond/rev/d2b5389ad0fc

New changeset 1a1eda211498 by Cédric Krier in branch '4.0':
Do not use defaultdict as changed value
http://hg.tryton.org/trytond/rev/1a1eda211498

New changeset 26a86be90be0 by Cédric Krier in branch '3.8':
Do not use defaultdict as changed value
http://hg.tryton.org/trytond/rev/26a86be90be0