[fix](json function) fix failed when json_exists_path use not null input #34289
cherry pick from #34289
run buildall
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run p0
run buildall
TeamCity be ut coverage result: Function Coverage: 37.82% (8099/21417) Line Coverage: 29.46% (66118/224404) Region Coverage: 28.96% (34084/117691) Branch Coverage: 24.82% (17497/70508) Coverage Report: http://coverage.selectdb-in.cc/coverage/6612aec4ac1fd6f9a0f4534136e768486ced4220_6612aec4ac1fd6f9a0f4534136e768486ced4220/report/index.html