Replace item dialogs with Popups for better integration

inventory/pages/add_page.py

@@ -74,6 +74,8 @@ class AddPage(rio.Component):
             self.popup_show = False
         else: 
             # OK, add part
+            if self.location == "":
+                self.location_code = ""
             if create_item(self.partnum, self.serial, self.office, self.code, locationid=self.location_code, description=self.description, manufacturer=self.manu, mac=self.mac, fwver=self.fwver) == False:
                 self.popup_message = "\n  Duplicate barcode!  \n\n"
                 self.popup_show = True