🐛 fixed bug with get_params method when capping_values=None #311
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Fixes issue raised in #292
Moved setting of self.capping_values out of conditional block so it still happens when capping_values= None.
The lack of a capping_values attribute was causing issues with the get_params method inherited from sklearn.
Added a test for just this transformer. Arguably should add for rest of package too via base_tests.OtherBaseBehaviour but this would be more involved as it requires iterating through all optional attributes set to None. I suspect this would require a configuration somewhere as there are probably quite a few cases where args cannot be optional at the same time.