Use str() to get exception message (#2590)

changelogs/fragments/2590-netcup_dns-exception-no-message-attr.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - netcup_dns - use ``str(ex)`` instead of unreliable ``ex.message`` in exception handling to fix ``AttributeError`` in error cases (https://github.com/ansible-collections/community.general/pull/2590).

plugins/modules/net_tools/netcup_dns.py

@@ -255,7 +255,7 @@ def main():
                 has_changed = True
 
     except Exception as ex:
-        module.fail_json(msg=ex.message)
+        module.fail_json(msg=str(ex))
 
     module.exit_json(changed=has_changed, result={"records": [record_data(r) for r in all_records]})