JS error on the address book process page because #stBreak element is missing

[marco-pm]

index.php?main_page=address_book_process&edit=1:720 Uncaught TypeError: Cannot set properties of null (setting 'className')
    at hideStateField (index.php?main_page=address_book_process&edit=1:720)
    at update_zone (index.php?main_page=address_book_process&edit=1:423)
    at onload (index.php?main_page=address_book_process&edit=1:888)

This is because the bootstrap template doesn't include the stBreak element, and in the ZC script jscript_addr_pulldowns.php (under address_book_process) there is no check that stBreak actually exists on the page (unlike stText):

    if (document.getElementById("stText")) {
      document.getElementById("stText").className = 'hiddenField';
      document.getElementById("stText").setAttribute('className', 'hiddenField');
    }
    document.getElementById("stBreak").className = 'hiddenField';
    document.getElementById("stBreak").setAttribute('className', 'hiddenField');

I would therefore add it somewhere, e.g. in tpl_address_book_process_default.php, with d-none class, so that the js error is not thrown. Of course the ideal solution would be to add the check in the ZC core js file.

[lat9]

Noting that the change is made to tpl_modules_common_address_format.php so that the issue gets squished for the create-account and multi-page checkout pages' processing, too.