[Autosaver] Remove effect with connections breaks

[SrMouraSilva]

How:

• Add a effect
• Add TWO connections for this effect
• Remove effect

How to work around the problem:

• Remove one connection
• Remove effect

Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.4/site-packages/webservice/util/handler_utils.py", line 58, in wrapped
    f(*args, **kwargs)
  File "/home/pi/.local/lib/python3.4/site-packages/webservice/util/handler_utils.py", line 58, in wrapped
    f(*args, **kwargs)
  File "/home/pi/.local/lib/python3.4/site-packages/webservice/util/handler_utils.py", line 30, in wrapped
    f(*args, **kwargs)
  File "/home/pi/.local/lib/python3.4/site-packages/webservice/handler/effect_handler.py", line 59, in delete
    del pedalboard.effects[effect_index]
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/observer/observable_list.py", line 135, in __delitem__
    self.observer(UpdateType.DELETED, item, sliced)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/pedalboard.py", line 103, in _effects_observer
    self._clear_effect(effect)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/pedalboard.py", line 113, in _clear_effect
    self.connections.remove(connection)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/observer/observable_list.py", line 63, in remove
    self.observer(UpdateType.DELETED, item, index)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/pedalboard.py", line 119, in _connections_observer
    self.observer.on_connection_updated(connection, update_type, pedalboard=self, **kwargs)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/observer/observer_manager.py", line 77, in on_connection_updated
    observer.on_connection_updated(connection, update_type, pedalboard=pedalboard, **kwargs)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/observer/autosaver/autosaver.py", line 165, in on_connection_updated
    self.banks_files.save_bank(pedalboard.bank)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/observer/autosaver/banks_files.py", line 60, in save_bank
    Persistence.save(path, bank.json)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/bank.py", line 121, in json
    return self.__dict__
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/bank.py", line 133, in __dict__
    'pedalboards': [pedalboard.json for pedalboard in self.pedalboards]
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/bank.py", line 133, in <listcomp>
    'pedalboards': [pedalboard.json for pedalboard in self.pedalboards]
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/pedalboard.py", line 128, in json
    return self.__dict__
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/pedalboard.py", line 135, in __dict__
    'connections': [connection.json for connection in self.connections],
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/pedalboard.py", line 135, in <listcomp>
    'connections': [connection.json for connection in self.connections],
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/connection.py", line 97, in json
    return self.__dict__
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/connection.py", line 102, in __dict__
    'output': self.output.json,
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/output.py", line 137, in json
    return self.__dict__
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/lv2/lv2_output.py", line 50, in __dict__
    dictionary = super(Lv2Output, self).__dict__
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/output.py", line 142, in __dict__
    'effect': self.effect.index,
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/model/effect.py", line 150, in index
    return self.pedalboard.effects.index(self)
  File "/home/pi/.local/lib/python3.4/site-packages/pluginsmanager/observer/observable_list.py", line 69, in index
    return self._list.index(x)
ValueError: <Lv2Effect object as 'Calf Saturator' not active at 0x75d9fb50> is not in list