negative index on empty arrays gives index out of bound instead of giving null output. #77
Description
jsonata: [][-1]
js output: ** no match **
java output: Index -1 out of bounds for length 0
jsonata: [][1]
js output: ** no match **
java output: null
input json:{"item": []}
jsonata: item[-1]
js output: ** no match **
java output:Index -1 out of bounds for length 0
jsonata: item[-2]
js output: ** no match **
java output:Index -2 out of bounds for length 0
jsonata: item[0]
js output: ** no match **
java output:null
jsonata: item[1]
js output: ** no match **
java output:null
positive indexes looks good. but on accessing negative indexes, instead of resulting in null, exception IndexOutOfBound is thrown.