LanguageUpgradePathTestCase fails with TypeError exception.
The LanguageUpgradePathTestCase fails with Argument 1 passed to BackdropDatabaseCache::get() must be of the type string, null given, called in /home/vmadmin/silkscreen/docroot/core/includes/path.inc on line 84
Fix: check $cid
is not NULL before calling BackdropDatabaseCache::get()