just include the possibility of @array[0..-1] which returns an empty list.
try something like:
@array[0 .. (int rand (@array+1)) -1]
DB<130> @array=a..c
=> ("a", "b", "c")
DB<131> @array[0 .. -1 + int rand 1+ @array]
=> ()
DB<132> @array[0 .. -1 + int rand 1+ @array]
=> ("a", "b")
DB<133> @array[0 .. -1 + int rand 1+ @array]
=> ("a")
DB<134> @array[0 .. -1 + int rand 1+ @array]
=> ("a", "b", "c")
DB<135> @array[0 .. -1 + int rand 1+ @array]
=> ("a", "b")
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