This issue closely relates to fix added to
LPS-73959 above describes how user should not be able to save empty notification template. This issue was fixed for master and 7.1.x, but no UI response is shown when workflow input is invalid. Error message is not displayed after workflow is not published.
1. Start a clean bundle
2. From Control Panel > Kaleo Designer create a new workflow
*Note that it only has 2 nodes, StartNode and EndNode
3. In EndNode, double click on the slot for "Notifications".
4. Select "User Notification" at Notification Type
5. Template Language: Freemarker and leave empty for Template
Error message should display notifying of empty template
There is no error message and the workflow is not published