PHP 7.2 error when bulk importing people via Leap2A

[Kristina Hoeppner]

I received the following error on Ubuntu 18.04 with PHP 7.2 running Postgres. Robert said it was a PHP 7.2 bug:

[WAR] d3 (artefact/internal/import/leap/lib.php:490) count(): Parameter must be an array or an object that implements Countable
Call stack (most recent first):

    log_message("count(): Parameter must be an array or an object t...", 8, true, true, "/home/kristina/code/mahara/htdocs/artefact/interna...", 490) at /home/kristina/code/mahara/htdocs/lib/errors.php:521
    error(2, "count(): Parameter must be an array or an object t...", "/home/kristina/code/mahara/htdocs/artefact/interna...", 490, array(size 11)) at /home/kristina/code/mahara/htdocs/artefact/internal/import/leap/lib.php:490
    LeapImportInternal::import_author_data(object(PluginImportLeap), "portfolio:artefactinternal") at /home/kristina/code/mahara/htdocs/lib/mahara.php:1817
    call_static_method("LeapImportInternal", "import_author_data", object(PluginImportLeap), "portfolio:artefactinternal") at /home/kristina/code/mahara/htdocs/import/leap/lib.php:691
    PluginImportLeap->import_from_load_mapping() at /home/kristina/code/mahara/htdocs/import/leap/lib.php:188
    PluginImportLeap->process() at /home/kristina/code/mahara/htdocs/admin/users/bulkimport.php:253
    import_next_user("/var/lib/maharadata/master/import/1/1567737296/use...", "admin_", "1") at /home/kristina/code/mahara/htdocs/admin/users/bulkimport.php:165
    bulkimport_submit(object(Pieform), array(size 6)) at /home/kristina/code/mahara/htdocs/lib/pieforms/pieform.php:544
    Pieform->__construct(array(size 2)) at /home/kristina/code/mahara/htdocs/lib/pieforms/pieform.php:166
    Pieform::process(array(size 2)) at /home/kristina/code/mahara/htdocs/lib/mahara.php:5400
    pieform(array(size 2)) at /home/kristina/code/mahara/htdocs/admin/users/bulkimport.php:325

To replicate:

1. Go to the bulkimport page in master /admin/users/bulkimport.php
2. Upload the attached Leap2A file that is a bulk export file.
Expected result: No error messages on the screen.
Actual result: You get the above error.