Error Netflix Addon

* I'm submitting a ...*
- [X] bug report
- [ ] feature request
- [ ] support request

## General information

### Description
Hi everybody, I'm using Netflix on Raspberry Pi3 through osmc. Till yesterday all was fine, but today I can't access to my profile anymore because of an error (KeyError: Null) that I can't understand. May someone help me?
In the following the details of the error

### Steps to Reproduce

1. [Access to Netflix addon]
2. [Select my profile]
3. [Error occurs]

**Expected behavior:** Netflix starts allowing to select videos

**Actual behavior:** Netflix doesn't start

#### Additional informatin on the environment

Netflix version 0.15.5
Author: libdev + jojo +asciidisco + caphm + castagnait

## Debug log

https://paste.osmc.tv/lesejuveyu

Start by reproducing the error through the Netflix addon on a Raspberry Pi running OSMC: access the addon and select a profile. Inspect the linked debug log for the KeyError: Null traceback; done means profile selection succeeds and Netflix allows video selection.

Written by the indexing model from the issue text.