Fix Constant field rejecting None values during load #2894
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Signed-off-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>
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PR summary:
Constant(None)was rejecting null values during load with "Field may not be null" becauseallow_nonewas being inferred before the constant value was assigned. Moving the default assignments beforesuper().__init__(), lets the base class correctly inferallow_none=Truewhen the constant isNone.Fixes #2868.