Commits on Oct 13, 2022

1. Engine: Do not call serializer for None values …

   Any port that defines a `serializer`, will have that serializer invoked
   when a value is passed to this port. The invokation was correctly
   skipped if no serializer was defined or if the value already was a
   `Data` node (in which case serialization is no longer needed), but it
   was also called when this value is `None`.
   
   It arguably doesn't make sense to serialize a value that has not been
   defined. This behavior would cause problems for processes that define a
   port with a serializer but that also accept `None`. In this case the
   serializer would nevertheless be called and, in the case of the
   `to_aiida_type` serializer for example, would except.

   

   sphuber committed Oct 13, 2022
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