fix(command): Remove unneeded conditions

Author: pan93412

src/Command/CreateUsersCommand.php

@@ -151,7 +151,7 @@ private static function parseUsers(string $filename): array
             $roles = $row[$rolesIndex];
             $group = false !== $groupIndex ? $row[$groupIndex] : null;
 
-            if (!\is_string($email) || !\is_string($name) || !\is_string($roles) || (!\is_string($group) && null !== $group)) {
+            if (!\is_string($email) || !\is_string($name) || !\is_string($roles) || !\is_string($group)) {
                 throw new \RuntimeException("Invalid row in $filename.");
             }