Bom export fix (#10163)

* Bug fix for BOM exporter

- Handle edge case with null manufacturer value

* Mark failed data exports

src/backend/InvenTree/data_exporter/mixins.py

@@ -351,10 +351,13 @@ class DataExportViewMixin:
             filename = export_plugin.generate_filename(
                 serializer_class.Meta.model, export_format
             )
-        except Exception:
+        except Exception as e:
             InvenTree.exceptions.log_error(
                 'generate_filename', plugin=export_plugin.slug
             )
+
+            output.mark_failure(error=str(e))
+
             raise ValidationError(export_error)
 
         # The provided plugin is responsible for exporting the data
@@ -364,8 +367,12 @@ class DataExportViewMixin:
                 queryset, serializer_class, headers, export_context, output
             )
 
-        except Exception:
+        except Exception as e:
             InvenTree.exceptions.log_error('export_data', plugin=export_plugin.slug)
+
+            # Log the error against the output object
+            output.mark_failure(error=str(e))
+
             raise ValidationError(export_error)
 
         if not isinstance(data, list):
@@ -377,17 +384,21 @@ class DataExportViewMixin:
         if hasattr(export_plugin, 'update_headers'):
             try:
                 headers = export_plugin.update_headers(headers, export_context)
-            except Exception:
+            except Exception as e:
                 InvenTree.exceptions.log_error(
                     'update_headers', plugin=export_plugin.slug
                 )
+
+                output.mark_failure(error=str(e))
+
                 raise ValidationError(export_error)
 
         # Now, export the data to file
         try:
             datafile = serializer.export_to_file(data, headers, export_format)
-        except Exception:
+        except Exception as e:
             InvenTree.exceptions.log_error('export_to_file', plugin=export_plugin.slug)
+            output.mark_failure(error=str(e))
             raise ValidationError(_('Error occurred during data export'))
 
         # Update the output object with the exported data

src/backend/InvenTree/plugin/builtin/exporter/bom_exporter.py

@@ -275,7 +275,9 @@ class BomExporterPlugin(DataExportMixin, InvenTreePlugin):
         for supplier_part in bom_item.sub_part.supplier_parts.all():
             manufacturer_part = supplier_part.manufacturer_part
             supplier_part_data.update({
-                f'supplier_name_{idx}': supplier_part.supplier.name,
+                f'supplier_name_{idx}': supplier_part.supplier.name
+                if supplier_part.supplier
+                else '',
                 f'supplier_sku_{idx}': supplier_part.SKU,
                 f'supplier_mpn_{idx}': manufacturer_part.MPN
                 if manufacturer_part
@@ -296,7 +298,9 @@ class BomExporterPlugin(DataExportMixin, InvenTreePlugin):
 
         for manufacturer_part in bom_item.sub_part.manufacturer_parts.all():
             manufacturer_part_data.update({
-                f'manufacturer_name_{idx}': manufacturer_part.manufacturer.name,
+                f'manufacturer_name_{idx}': manufacturer_part.manufacturer.name
+                if manufacturer_part.manufacturer
+                else '',
                 f'manufacturer_mpn_{idx}': manufacturer_part.MPN,
             })