minor code change
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@@ -54,10 +54,9 @@ class BaseValueManager(object):
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default_value = self.column.get_default()
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if self.column._val_is_null(default_value):
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return not self.column._val_is_null(self.value) and self.value != self.previous_value
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else:
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if self.previous_value is None:
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elif self.previous_value is None:
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return self.value != default_value
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else:
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return self.value != self.previous_value
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return False
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