Fix compute_cost_price

issue2720
review570002
(transplanted from aea0802162b1ce5311048a35017f0d0e3cf1fc77)

service.py

@@ -57,6 +57,7 @@ class Employee(ModelSQL, ModelView, Cacheable):
             for edate, ecost in employee_costs:
                 if date >= edate:
                     cost = ecost
+                else:
                     break
         return cost