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Unhandled error in lazy lookup plugin +thetvdb

See original GitHub issue

Flexget Version: 2.13.15 and 2.13.14
Python version: 2.7.14
Installation method: pip
Using daemon (yes/no) yes:
OS and version: Win10

Expected behaviour: Not to throw Critical Error

Actual behaviour: Critical Error, task stops running

Steps to reproduce:

ttv-list:
    metainfo_series: yes
    thetvdb_lookup: yes
    tvmaze_lookup: yes
    list_clear:
      what:
        - entry_list: tvlist
    accept_all: yes
    if:
      - tvmaze_series_status == 'Ended': reject
      - tvdb_status == 'Ended': reject
      - "'WWE' in title": reject
    set:
      title: "{{tvdb_series_name|default(tvmaze_series_name)|default(series_name)}}"
    next_trakt_episodes:
      < trackt login data>
      context: watched
      strip_dates: yes
    list_add:
      - entry_list: tvlist

Log:

2018-05-07 23:40 ERROR    lazy_lookup   ttv-list  Unhandled error in lazy lookup plugin
Traceback (most recent call last):
  File "c:\python27\lib\site-packages\flexget\utils\lazy_dict.py", line 37, in __getitem__
    func(self.store)
  File "c:\python27\lib\site-packages\flexget\plugins\metainfo\thetvdb_lookup.py", line 159, in lazy_episode_lookup
    entry.update_using_map(self.episode_map, episode)
  File "c:\python27\lib\site-packages\flexget\entry.py", line 276, in update_using_map
    v = value(source_item)
  File "c:\python27\lib\site-packages\flexget\plugins\metainfo\thetvdb_lookup.py", line 99, in <lambda>
    'tvdb_ep_id': lambda ep: 'S%02dE%02d' % (ep.season_number, ep.episode_number)
TypeError: %d format: a number is required, not NoneType`