Fix crash on empty block parameters || and |; x|#451
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Prism returns BlockParametersNode with `parameters: nil` for `{ || ... }`
and `{ |; x| ... }`. CallBaseNode#initialize did not handle this and
raised NoMethodError on `params.requireds`.
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Prism returns BlockParametersNode with
parameters: nilfor{ || ... }and
{ |; x| ... }. CallBaseNode#initialize did not handle this andraised NoMethodError on
params.requireds.