tree a8b95b6e3922dd213ecf84cb9d2cab84609e2b90
parent f63583928fc1784a98082e46fcb5d8c5445afb08
author Yunjie Li <yunjieli@google.com> 1582680578 -0800
committer Yunjie Li <yunjieli@google.com> 1582747438 -0800

ObjectWalk: Add null check before skip tree.

currVisit could be null if a blob is marked as start point in
ObjectWalk. Add null check before skipping current tree.

Change-Id: Ic5d876fe2800f3373d136979be6c27d1bbd38dc1
Signed-off-by: Yunjie Li <yunjieli@google.com>