Skip itemsuppliers for suppliers that have been archived or excluded …

…for whatever other reason

frepple/controllers/outbound.py

@@ -1138,7 +1138,10 @@ def export_items(self):
                     )
                 suppliers = {}
                 for sup in results:
-                    name = self.map_customers.get(sup["partner_id"][0])
+                    name = self.map_customers.get(sup["partner_id"][0], None)
+                    if not name:
+                        # Skip uninterested suppliers (eg archived ones)
+                        continue
                     if sup.get("is_subcontractor", False):
                         if not hasattr(tmpl, "subcontractors"):
                             tmpl["subcontractors"] = []