fix 500 error due to no headers, fix part bom export on home page issue

#49

bom/forms.py

@@ -1051,9 +1051,11 @@ def clean(self):
             headers = [h.lower() for h in next(reader)]
 
             # Handle utf-8-sig encoding
-            if "\ufeff" in headers[0]:
+            if len(headers) > 0 and "\ufeff" in headers[0]:
                 reader = csv.reader(codecs.iterdecode(file, 'utf-8-sig'), dialect)
                 headers = [h.lower() for h in next(reader)]
+            elif len(headers) == 0:
+                self.warnings.append("No headers found in CSV file.")
 
             csv_headers = BOMIndentedCSVHeaders()
 

bom/part_bom.py

@@ -43,6 +43,8 @@ def append_item_and_update(self, item):
 
     def update_bom_for_part(self, bom_part):
         if bom_part.do_not_load:
+            bom_part.order_quantity = 0
+            bom_part.order_cost = 0
             return
 
         if bom_part.seller_part:
@@ -124,6 +126,7 @@ def extended_cost(self):
 
     def out_of_pocket_cost(self):
         try:
+            print(self.order_quantity, self.seller_part.unit_cost)
             return self.order_quantity * self.seller_part.unit_cost
         except (AttributeError, TypeError) as err:
             logger.log(logging.INFO, '[part_bom.py] ' + str(err))

bom/views/views.py

@@ -584,8 +584,8 @@ def part_export_bom(request, part_id=None, part_revision_id=None, flat=False, so
         return HttpResponseRedirect(request.META.get('HTTP_REFERER'), '/')
 
     response = HttpResponse(content_type='text/csv')
-    response['Content-Disposition'] = 'attachment; filename="{}_indabom_parts_indented.csv"'.format(
-        part.full_part_number())
+    filename = f'indabom_export_{part.full_part_number()}_{"flat" if flat else "indented"}'
+    response['Content-Disposition'] = f'attachment; filename="{filename}.csv'
 
     qty_cache_key = str(part_id) + '_qty'
     qty = cache.get(qty_cache_key, 1000)