Fix ScrollOffset calculation when childCount is null (#17722)

diff --git a/AUTHORS b/AUTHORS
index fd1df22..4516816 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -22,3 +22,4 @@
 Ali Bitek <alibitek@protonmail.ch>
 Tetsuhiro Ueda <najeira@gmail.com>
 Dan Field <dfield@gmail.com>
+Noah Groß <gross@ngsger.de>