frn codice nan

update.py

@@ -9,7 +9,7 @@ def update_records(connection,codice,prezzo,sc1,sc2,listino,ricarica,codice_barr
     print('test test')
     cursor = connection.cursor()
     cursor_select = connection.cursor()
-    print('cursor test')
+    print(codice_alternativo)
     try:
         result = []
         print('test 1')
@@ -55,7 +55,7 @@ def update_records(connection,codice,prezzo,sc1,sc2,listino,ricarica,codice_barr
             count = cursor.rowcount
             result.append(count)
         print('test 8')
-        if frn is not None:
+        if frn is not None and math.isnan(frn):
             query_art = "UPDATE art SET FRN_CODICE = %s WHERE codice = %s"
             cursor.execute(query_art, (frn, codice))
             count = cursor.rowcount