[statistics] 500 coming from dashboard

[regisoc]

Describe the bug

Follows the last comment from #9232.

Tested it, not a same issue anymore: redirects to a 500.

This is the log:

PHP Fatal error:  Uncaught TypeError: LORIS\\statistics\\Statistics_Site::_checkCriteria(): Argument #1 ($centerID) must be of type CenterID, string given, called in /var/www/Loris/modules/statistics/php/statistics_site.class.inc on line 189 and defined in /var/www/Loris/modules/statistics/php/statistics_site.class.inc:97\nStack trace:\n#0 /var/www/Loris/modules/statistics/php/statistics_site.class.inc(189): LORIS\\statistics\\Statistics_Site->_checkCriteria()\n#1 /var/www/Loris/modules/statistics/php/statistics_site.class.inc(277): LORIS\\statistics\\Statistics_Site->_completeCount()\n#2 /var/www/Loris/php/libraries/NDB_Page.class.inc(741): LORIS\\statistics\\Statistics_Site->setup()\n#3 /var/www/Loris/src/Middleware/UserPageDecorationMiddleware.php(247): NDB_Page->handle()\n#4 /var/www/Loris/src/Middleware/PageDecorationMiddleware.php(58): LORIS\\Middleware\\UserPageDecorationMiddleware->process()\n#5 /var/www/Loris/php/libraries/NDB_Page.class.inc(725): LORIS\\Middleware\\PageDecorationMiddleware->process()\n#6 /var/www/Loris/php/libraries/Module.class.inc(321): NDB_Page->process()\n#7 /var/www/Loris/src/Middleware/ResponseGenerator.php(50): Module->handle()\n#8 /var/www/Loris/src/Middleware/AuthMiddleware.php(63): LORIS\\Middleware\\ResponseGenerator->process()\n#9 /var/www/Loris/src/Router/ModuleRouter.php(74): LORIS\\Middleware\\AuthMiddleware->process()\n#10 /var/www/Loris/src/Middleware/ExceptionHandlingMiddleware.php(54): LORIS\\Router\\ModuleRouter->handle()\n#11 /var/www/Loris/src/Router/BaseRouter.php(132): LORIS\\Middleware\\ExceptionHandlingMiddleware->process()\n#12 /var/www/Loris/src/Middleware/ResponseGenerator.php(50): LORIS\\Router\\BaseRouter->handle()\n#13 /var/www/Loris/src/Middleware/ContentLength.php(52): LORIS\\Middleware\\ResponseGenerator->process()\n#14 /var/www/Loris/htdocs/index.php(73): LORIS\\Middleware\\ContentLength->process()\n#15 {main}\n  thrown in /var/www/Loris/modules/statistics/php/statistics_site.class.inc on line 97, referer: https://rongarocarcy-dev.loris.ca/

CenterID not initialized to a defined \CenterID object here.
Do we have a default site? The same kind might happen for ProjectID too.

To Reproduce
Steps to reproduce the behavior (attach screenshots if applicable):

1. Go to LORIS main page
2. Click on right panel, "My tasks" > "incomplete form"

3. See error

[driusan]

This should be fixed by #9354