[FIX] hr_payroll: skip missing structures in get_all_structures for hr.contracts...

bzr revid: mat@openerp.com-20131223124413-k0st3i54zou2bga8

diff --cc addons/hr_payroll/hr_payroll.py
index 5fd74ff,95ae878..f944e8b
--- 1/addons/hr_payroll/hr_payroll.py
--- 2/addons/hr_payroll/hr_payroll.py
+++ b/addons/hr_payroll/hr_payroll.py
@@@ -145,8 -145,10 +145,9 @@@ class hr_contract(osv.osv)
          @param contract_ids: list of contracts
          @return: the structures linked to the given contracts, ordered by hierachy (parent=False first, then first level children and so on) and without duplicata
          """
--        all_structures = []
-         structure_ids = [contract.struct_id.id for contract in self.browse(cr, uid, contract_ids, context=context)]
+         structure_ids = [contract.struct_id.id for contract in self.browse(cr, uid, contract_ids, context=context) if contract.struct_id]
+         if not structure_ids:
+             return []
          return list(set(self.pool.get('hr.payroll.structure')._get_parent_structure(cr, uid, structure_ids, context=context)))
  
  hr_contract()