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Calendar button stops working if selector is closed without selecting date

See original GitHub issue

~Haven’t yet discovered how to reliably reproduce this yet. Happens when I’m adjusting inventory in the Inventory dialog - I think after having already submitted at least one change.~

On a fresh load of the Purchase or Inventory pages, click on the Calendar button for Best before, then after the selector appears, click the button again without selecting a date. Selector closes. Clicking the calendar button again gives no response.

The following errors are output to the console when clicking to close the calendar selector:

tempusdominus-bootstrap-4.min.js?v=1.24.1:7 Uncaught TypeError: Cannot read property 'clone' of undefined
    at k.hide (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at Function.k._jQueryHandleThis (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at w.fn.init.k._jQueryInterface [as datetimepicker] (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at HTMLInputElement.<anonymous> (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at HTMLDocument.dispatch (jquery.min.js?v=1.24.1:2)
    at HTMLDocument.y.handle (jquery.min.js?v=1.24.1:2)
    at Object.trigger (jquery.min.js?v=1.24.1:2)
    at Object.simulate (jquery.min.js?v=1.24.1:2)
    at HTMLDocument.n (jquery.min.js?v=1.24.1:2)

tempusdominus-bootstrap-4.min.js?v=1.24.1:7 Uncaught TypeError: Cannot read property 'isSame' of undefined
    at k._updateMonths (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at k._fillDate (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at k.r._update (tempusdominus-bootstrap-4.min.js?v=1.24.1:6)
    at k.show (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at k.r.toggle (tempusdominus-bootstrap-4.min.js?v=1.24.1:6)
    at Function.k._jQueryHandleThis (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at w.fn.init.k._jQueryInterface [as datetimepicker] (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at HTMLDivElement.<anonymous> (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at HTMLDocument.dispatch (jquery.min.js?v=1.24.1:2)
    at HTMLDocument.y.handle (jquery.min.js?v=1.24.1:2)

Subsequent clicks of the calendar button output the following error:

tempusdominus-bootstrap-4.min.js?v=1.24.1:7 Uncaught TypeError: Cannot read property 'clone' of undefined
    at k.hide (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at k.r.toggle (tempusdominus-bootstrap-4.min.js?v=1.24.1:6)
    at Function.k._jQueryHandleThis (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at w.fn.init.k._jQueryInterface [as datetimepicker] (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at HTMLDivElement.<anonymous> (tempusdominus-bootstrap-4.min.js?v=1.24.1:7)
    at HTMLDocument.dispatch (jquery.min.js?v=1.24.1:2)
    at HTMLDocument.y.handle (jquery.min.js?v=1.24.1:2)

Workaround is to reload the page.

I also note that the Best before information field (eg “4 months from now”) does not get cleared when the form is submitted.