[FIX] orm: _add_missing_default_values: Allowing only valid x2m default values (Ref : Case 4364)
[FIX] orm: _add_missing_default_values: Allowing only valid x2m default values (Ref : Case 4364)

akretion/openerp-server,akretion/openerp-server,akretion/openerp-server