Fix Zero Length check

[MikeAlhayek]

Fixes #23782

[dotnet-policy-service]

Hey there @MikeAlhayek! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[mattleibow]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[mgravell]

@MikeAlhayek I notice you have raised a large number of similar PRs over multiple repos; these PRs appear to be based on the incorrect assumption that every use of ?.Length == 0 (or similar) is automatically incorrect. As I have tried to express at length over in SE.Redis / PR, this syntax is neither right nor wrong, but changing the intent to something else is almost certainly wrong, unless there is a specific example scenario described. I'm going to strongly suggest you close all of those PRs, and only redo them if you are very sure, based on a fully considered example, that the ?.Length usage is actually incorrect.