PEP style fixes

InvenTree/order/api.py

@@ -337,7 +337,6 @@ class PurchaseOrderIssue(PurchaseOrderContextMixin, generics.CreateAPIView):
     serializer_class = serializers.PurchaseOrderIssueSerializer
 
 
-
 class PurchaseOrderReceive(PurchaseOrderContextMixin, generics.CreateAPIView):
     """
     API endpoint to receive stock items against a purchase order.

InvenTree/order/serializers.py

@@ -204,7 +204,7 @@ class PurchaseOrderCancelSerializer(serializers.Serializer):
 
         if not order.can_cancel():
             raise ValidationError(_("Order cannot be cancelled"))
-        
+
         order.cancel_order()
 
 
@@ -238,7 +238,6 @@ class PurchaseOrderIssueSerializer(serializers.Serializer):
 
     class Meta:
         fields = []
-    
 
     def save(self):
 

InvenTree/order/views.py

@@ -30,9 +30,8 @@ from common.files import FileManager
 from . import forms as order_forms
 from part.views import PartPricing
 
-from InvenTree.views import AjaxView, AjaxUpdateView
-from InvenTree.helpers import DownloadFile, str2bool
-from InvenTree.views import InvenTreeRoleMixin
+from InvenTree.helpers import DownloadFile
+from InvenTree.views import InvenTreeRoleMixin, AjaxView
 
 
 logger = logging.getLogger("inventree")