hasattr() raising ValueError when used with input and output attributes of a keras layer

[Doch88]

The description is self-explanatory, when using hasattr() on the input attribute of a keras layer it raises an error when the layer has not been called yet.

    if hasattr(first_layer, 'input'):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: The layer resizing has never been called and thus has no defined input.

This happens because "input" and "output" raise a ValueError, instead of a AttributeError as it should be.