date_and_time_field partial handles no timezone set on team

[wesgarrison]

This started happening when I updated to tag v1.7.4

If there is no timezone set on a Team (my db:reset did not set one by default) then checking ActiveSupport::TimeZone.find_tzinfo(current_team_time_zone) fails with

TZInfo::InvalidTimezoneIdentifier at /account/model/:id/new 
Invalid identifier: nil

Trace:

Also, I don't see where user_tz is being used, but we do things like <% if current_user&.time_zone != current_team_time_zone %> when that should maybe be the user_tz calculated above. (I didn't know if that's part of this issue or not and I don't have time to dig in more now.)

[jagthedrummer]

Thanks @wesgarrison. The test failures here are related to the fact that we recently updated the starter repo to use yarn version 4. I've address that problem for the core repo here: #832

I'm gonna go ahead and merge this and will watch CI on main.