
Like I9886cd44f8b4bae6f4a5ce3644f0598a73ecfe0a, have the zuul client send actual null values for oldrev/newrev instead of 0000000 which could lead to unintended behavior. Change-Id: I44994426493d05a039b5a1051504958b36729c9d Depends-On: https://review.opendev.org/867177