Return length-0 prototype for tfd(list())#299
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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Fixes #296.
tfd(list())was falling through to the per-entry processing intfd.list(), which ended up callingassert_numeric(arg[[1]])on an emptyarglist and raising "subscript out of bounds". Now an emptydatareturns the same length-0 prototype thattfd(numeric(0))already produces, and the two areidentical().Added a regression test in test-empty-prototypes.R.