Update notes for submitted changes

* Added check for null on DirCacheEntry in checkoutEntry method

aa/3a1ecd133628c4d9d211d2b227f96b5c3d9d8f

@@ -0,0 +1,7 @@
+Verified+1: JGit Bot <jgit-bot@eclipse.org>
+Code-Review+2: Christian Halstrick <christian.halstrick@sap.com>
+Submitted-by: Christian Halstrick <christian.halstrick@sap.com>
+Submitted-at: Wed, 30 Dec 2020 03:05:00 -0500
+Reviewed-on: https://git.eclipse.org/r/c/jgit/jgit/+/170224
+Project: jgit/jgit
+Branch: refs/heads/master