Ted Johansson fdcb429145
FIX: Handle null values in category settings relative time pickers (#20552)
As reported on Meta, the relative time pickers for configuring slow-mode and auto-close durations in category settings are initially showing a "mins" option, which then disappears after you select any other timescale.

Our `RelativeTimePicker` component wasn't equipped to handle `null` values as the initial input. This caused it to go into a code path that set the selected timescale to "mins", even if that is not an allowed option.

There are two things being done here:

1. Add support for `null` input values to `RelativeTimePicker`. This fixes the auto-close setting.
2. Allow minutes for the slow-mode setting. (The user in Meta mentioned they usually set 15-30 minutes to cool down hot topics.
2023-03-07 11:05:13 +08:00
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