I have a file with fixed-width columns and I would like to use
the second column to populate a select list parameter. My problem
is that the number of whitespaces changes depending on the content of
the first column. Given that split is used in the underlying code,
I wanted to give None as separator but I can't.
  If I put:
<options from_dataset="input_file" separator="None">

it's the string "None" that is considered as the separator

and if I write:
<options from_dataset="input_file" separator="">

then the exception "Empty separator" is raised.

  Should I put something else to do what I want? If not, would
it be possible to consider changing something in the code of
dynamic_options.py such as replacing the empty string with None
to let the split takes place for example?

  Thanks in advance,

Sophie Creno
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