Make test262-harness.py Python 3-compatible (#4381)
Make test262-harness.py Python 3-compatible (#4381)

Less operator is not supported between int and None in Python 3. Fix
that Python 2 legacy in test262-harness.py.

JerryScript-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com
akosthekiss/jerryscript,zherczeg/jerryscript,akosthekiss/jerryscript,jerryscript-project/jerryscript,jerryscript-project/jerryscript,dbatyai/jerryscript,zherczeg/jerryscript,robertsipka/jerryscript,zherczeg/jerryscript,jerryscript-project/jerryscript,bzsolt/jerryscript,bzsolt/jerryscript,dbatyai/jerryscript,zherczeg/jerryscript,dbatyai/jerryscript,robertsipka/jerryscript,zherczeg/jerryscript,akosthekiss/jerryscript,robertsipka/jerryscript,robertsipka/jerryscript,dbatyai/jerryscript,robertsipka/jerryscript,bzsolt/jerryscript,jerryscript-project/jerryscript,akosthekiss/jerryscript,bzsolt/jerryscript,dbatyai/jerryscript,robertsipka/jerryscript,akosthekiss/jerryscript,jerryscript-project/jerryscript,bzsolt/jerryscript