added missing raise

(cherry picked from commit 89f169127b)

changelogs/fragments/missing_raise.yml

@@ -0,0 +1,2 @@
+bugfixes:
+    - added missing 'raise' to exception definition https://github.com/ansible/ansible/pull/41690

lib/ansible/inventory/manager.py

@@ -375,7 +375,7 @@ class InventoryManager(object):
                     from random import shuffle
                     shuffle(hosts)
                 elif order not in [None, 'inventory']:
-                    AnsibleOptionsError("Invalid 'order' specified for inventory hosts: %s" % order)
+                    raise AnsibleOptionsError("Invalid 'order' specified for inventory hosts: %s" % order)
 
         return hosts