Schedule Guest Access doesn't work without a start date

[moriaiy]

Affected Version of Concrete CMS

8.5.x, 9.x

Description

In Schedule Guest Access, the three blocks were set up as follows:

1. Set both Start and End Date.
2. Set only Start Date.
3. Set only End Date.

When I check with the guest user, only the End Date is set (No. 3) is not displayed.
Other settings displayed.

Setting the Start Date would work around the problem.
However, it would be nice to be able to display the case where only the End Date is set.

How to reproduce

Settings

1. Set both Start and End Date.(From: 4/4/2024, To: 4/30/2024)
2. Set only Start Date.(From: 4/4/2024, To: none)
3. Set only End Date.(From: none, To: 4/30/2024)

Result

Possible Solution

No response

Additional Context

No response

[aembler]

This is fairly easy to fix – the problem is the getActiveRange method of AbstractRepetition returns null if there's no start date – but I'm a little worried about making that change without causing unintended consequences.