Do not fail sanitize_module_args it entries are missing

If `sanitize_module_args` is called from `rule_multi` or `rule_purge`
the args do not contain a `api_key` or `api_secret`. This leads to
KeyError exception instead of the nice error message.

plugins/module_utils/helper/main.py

@@ -506,6 +506,6 @@ def unset_check_error(params: dict, field: str, fail: bool) -> bool:
     return True
 
 def sanitize_module_args(args: dict) -> dict:
-    args.pop('api_key')
-    args.pop('api_secret')
+    args.pop('api_key', None)
+    args.pop('api_secret', None)
     return args