Update issue6039 (lead time required in production product)

issue5560_23131003.diff

@@ -180,7 +180,7 @@ diff -r 8b7857967585 trytond/trytond/modules/production/production.py
      @staticmethod
      def default_state():
          return 'draft'
-@@ -219,6 +248,17 @@
+@@ -219,6 +248,20 @@
      def default_company():
          return Transaction().context.get('company')
  
@@ -192,7 +192,10 @@ diff -r 8b7857967585 trytond/trytond/modules/production/production.py
 +            pattern.setdefault('bom', self.bom.id if self.bom else None)
 +            for line in self.product.lead_times:
 +                if line.match(pattern):
-+                    return self.planned_date - line.lead_time
++                    if line.lead_time:
++                        return self.planned_date - line.lead_time
++                    else:
++                        return self.planned_date
 +        return self.planned_date
 +
      def _move(self, from_location, to_location, company, product, uom,