[FIX] Preprocess Widget: Continuize type error

[ales-erjavec]

Issue

Due to 60e1369 the ContinuizeEditor raises an:

----------------------------- TypeError Exception -----------------------------
Traceback (most recent call last):
  File "/Users/aleserjavec/workspace/orange3/Orange/canvas/scheme/widgetsscheme.py", line 454, in create_widget_instance
    widget.__init__()
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/owpreprocess.py", line 1015, in __init__
    self._initialize()
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/owpreprocess.py", line 1036, in _initialize
    self.set_model(model)
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/owpreprocess.py", line 1108, in set_model
    self.controler.setModel(ppmodel)
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/utils/preprocess.py", line 265, in setModel
    self._initialize(model)
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/utils/preprocess.py", line 276, in _initialize
    self._insertWidgetFor(i, index)
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/utils/preprocess.py", line 398, in _insertWidgetFor
    widget = self.createWidgetFor(index)
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/utils/preprocess.py", line 415, in createWidgetFor
    widget = definition.viewclass()
  File "/Users/aleserjavec/workspace/orange3/Orange/widgets/data/owpreprocess.py", line 218, in __init__
    group.addButton(rb, int(treatment))
TypeError: int() argument must be a string, a bytes-like object or a number, not 'Continuize'
-------------------------------------------------------------------------------

Description of changes

Map the enum value to an integer index for internal radio button id use.

Includes

• Code changes
• Tests
• Documentation

[ales-erjavec]

Note that this applies to master only. The 60e1369 did not make it into 3.3.10

[codecov-io]

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