Fix Array.prototype.reduce and reduceRight (#3487)

Don't throw TypeError when object length is 0 and initialValue is undefined.
Additionally the error message should be more precise and match other engines.

Fixes #3463

JerryScript-DCO-1.0-Signed-off-by: Csaba Osztrogonác oszi@inf.u-szeged.hu

tests/jerry/array-prototype-reduce.js

@@ -39,6 +39,8 @@ catch(e) {
 // various checks
 assert ([].reduce(func, 1) === 1);
 
+assert ([].reduce(func, undefined) === undefined);
+
 assert ([0].reduce(func) === 0);
 
 assert ([0, 1].reduce(func) === 1);