Issue #3192905 by AaronBauman: More graceful handling in...

Issue #3192905 by AaronBauman: More graceful handling in GroupUserUpdateProcessor on invalid configuration 

ldap_user/src/Processor/GroupUserUpdateProcessor.php

@@ -295,6 +295,13 @@ class GroupUserUpdateProcessor {
         return;
       }
     }
+    if (!$uid) {
+      $this->logger->error(
+        'Periodic update: Error creating user @name',
+        ['@name' => $username]
+      );
+      return;
+    }
 
     // User exists and is mapped in authmap.
     /** @var \Drupal\user\Entity\User $drupal_account */