Pidgin XMPP test fails with 'No handlers could be found for logger "jabberbot"'

Originally created by @intrigeri on #9375 (Redmine)

While testing 1.4:

  @check_tor_leaks
  Scenario: Chatting with some friend over XMPP                            # features/pidgin.feature:17
    When I start Pidgin through the GNOME menu                             # features/step_definitions/pidgin.rb:252
    Then I see Pidgin's account manager window                             # features/step_definitions/pidgin.rb:263
    When I create my XMPP account                                          # features/step_definitions/pidgin.rb:21
    And I close Pidgin's account manager window                            # features/step_definitions/pidgin.rb:268
    Then Pidgin automatically enables my XMPP account                      # features/step_definitions/pidgin.rb:43
No handlers could be found for logger "jabberbot"
    Given my XMPP friend goes online                                       # features/step_definitions/pidgin.rb:49
      FindFailed: can not find PidginFriendOnline.png on the screen.
      Line ?, in File ? (RuntimeError)
      features/pidgin.feature:23:in `Given my XMPP friend goes online'

Feature Branch: kytv:test/9375-jabberbot-logger

Parent Task: #8539 (closed)