npn can be null as is inventree allowed

InventreeBarcodeGenerator/Form1.cs

@@ -367,7 +367,7 @@ namespace BlubbFish.Applications.Barcodes.Inventree {
               r.Cells[3].Value = new LineItem {
                 Name = item["internal_part_name"].ToString(),
                 SKU = item["sku"].ToString(),
-                MPN = item["mpn"].ToString(),
+                MPN = item["mpn"] is null ? "" : item["mpn"].ToString(),
                 LineNr = i,
                 Quantity = quantity,
                 EciaFormat = new Ecia {
@@ -375,7 +375,7 @@ namespace BlubbFish.Applications.Barcodes.Inventree {
                   SupplierOrderNumber = po.SupplierReference,
                   ShipDate = DateTime.Now.ToString("yyyyMMdd"),
                   SKU = item["sku"].ToString(),
-                  MPN = item["mpn"].ToString(),
+                  MPN = item["mpn"] is null ? "": item["mpn"].ToString(),
                   CustomerPOLine = i++.ToString(),
                   Quantity = quantity,
                   DateCode = DateTime.Now.ToString("yy01"),

InventreeBarcodeGenerator/InventreeBarcodeGenerator.csproj

@@ -74,5 +74,10 @@
 		  <PackagePath>\</PackagePath>
 		</None>
 	</ItemGroup>
+	<ItemGroup>
+	  <None Update="Res\store.py">
+	    <CopyToOutputDirectory>Never</CopyToOutputDirectory>
+	  </None>
+	</ItemGroup>
 
 </Project>

InventreeBarcodeGenerator/Res/store.py

@@ -14,19 +14,20 @@ from plugin.mixins import SettingsMixin, SupplierBarcodeMixin
 
 class ReicheltPlugin(SupplierBarcodeMixin, SettingsMixin, InvenTreePlugin):
     """Plugin to integrate the Barcodes into InvenTree."""
+    DEFAULT_SUPPLIER_NAME = 'Reichelt'
 
-    NAME = 'ReicheltBarcodePlugin'
-    SLUG = 'Reicheltplugin'
-    TITLE = _('Supplier Integration - Reichelt')
-    DESCRIPTION = _('Provides support for scanning Reichelt barcodes')
+    NAME = DEFAULT_SUPPLIER_NAME+'BarcodePlugin'
+    SLUG = DEFAULT_SUPPLIER_NAME+'plugin'
+    TITLE = _('Supplier Integration - '+DEFAULT_SUPPLIER_NAME)
+    DESCRIPTION = _('Provides support for scanning '+DEFAULT_SUPPLIER_NAME+' barcodes')
     VERSION = '1.0.0'
     AUTHOR = _('BlubbFish')
 
-    DEFAULT_SUPPLIER_NAME = 'Reichelt'
+    
     SETTINGS = {
         'SUPPLIER_ID': {
             'name': _('Supplier'),
-            'description': _("The Supplier which acts as 'Reichelt'"),
+            'description': _("The Supplier which acts as '"+DEFAULT_SUPPLIER_NAME+"'"),
             'model': 'company.company',
             'model_filters': {'is_supplier': True},
         }