1) create a cloud and use username & password
2) go to cloud view, choose "Edit Connection" in the context menu
3) rename your cloud & hit finish
4) restart the Deltacloud tools
5) now go to instace-view and pick the cloud you renamed

Result:
The instances cannot be listed, you get an appropriate error message

6) go to the cloud view and pick "Edit Connection" in the context menu

Result
Password field is empty