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CRITICAL error in task with plugin email

See original GitHub issue

Expected behaviour:

Send an email

Actual behaviour:

Critical error BUG: Unhandled error in plugin email: ‘in <string>’ requires string as left operand, not int

Steps to reproduce:

Use this config.yml

Config:

templates:
  global:
    email:
      from: xxx@domain.com
      to: xxx@gmail.com
      smtp_host: domain.com
      smtp_port: 587
      smtp_username: xxx@domain.com
      smtp_password: _thepasss123_
      smtp_tls: true
  # Series
  series-dir:
    thetvdb_lookup: yes
    series:
      agroup:
        - House
        - Westworld
tasks:
  sort-series:
    priority: 10
    filesystem:
      path: /downloaded/
      regexp: '.*\.(avi|mkv|mp4)$'
      recursive: yes
    seen: local
    template:
      - series-dir
    series:
      settings:
        agroup:
          parse_only: yes
    require_field: series_name
    accept_all: yes
    move:
      to: /series/{{tvdb_series_name|default(series_name)}}/s{{tvdb_series_season|default(series_season)}}/

Log:

2016-12-16 20:45 CRITICAL task          sort-series     BUG: Unhandled error in plugin email: 'in <string>' requires string as left operand, not int
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flexget/task.py", line 483, in __run_plugin
    return method(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/flexget/event.py", line 23, in __call__
    return self.func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/flexget/plugins/notifiers/email.py", line 167, in on_task_output
    plugin.get_plugin_by_name('notify').instance.send_notification(task, notify_config)
  File "/usr/local/lib/python2.7/dist-packages/flexget/plugins/notifiers/notify.py", line 152, in send_notification
    notifier.notify(**notification_data)
  File "/usr/local/lib/python2.7/dist-packages/flexget/plugins/notifiers/email.py", line 151, in notify
    mailServer.login(str(smtp_username), str(smtp_password))
  File "/usr/lib/python2.7/smtplib.py", line 607, in login
    (code, resp) = self.docmd(encode_cram_md5(resp, user, password))
  File "/usr/lib/python2.7/smtplib.py", line 571, in encode_cram_md5
    response = user + " " + hmac.HMAC(password, challenge).hexdigest()
  File "/usr/lib/python2.7/hmac.py", line 75, in __init__
    self.outer.update(key.translate(trans_5C))
  File "/usr/local/lib/python2.7/dist-packages/future/types/newstr.py", line 390, in translate
    if ord(c) in table:
TypeError: 'in <string>' requires string as left operand, not int