Negative array indexes throw errors instead of empty matches if outside of range

[torbenw]

• When trying to get a non-existing value in an array with a positive index value, the returned matches are empty (correct)
• When trying to get a non-existing value in an array with a negative index value, an error "list index out of range" is returned instead (wrong)

Example data:

[
  "text"
]

Example expressions:
[0] -> returns "text"
[1] -> returns an empty matches list
[-1] -> returns "text"
[-2] -> throws IndexError "list index out of range"