Fix #4028: check whether the user info is null.

[zyhfish]

No description provided.

[sbwalker]

@zyhfish this code change is not valid:

 if (PageState.Runtime == Shared.Runtime.Hybrid && PageState.User != null)

It changes the meaning of the condition - instead of having logic dedicated to the Hybrid scenario, it will now execute the non-Hybrid logic if the User is null. If we want to include a null check then it needs to be within the Hybrid logic:

 if (PageState.Runtime == Shared.Runtime.Hybrid)
 {
    if (PageState.User != null)
    {

[zyhfish]

Hi @sbwalker , thx so much for the review, code is updated.