OWB exception is thrown when saving a project without tasks and with % Complete Calculation Method set to Duration
Steps to Reproduce:
1. Create a new Project. Make sure it does not have any task (not even the effort task).
2. Change the "% Complete Calculation Method" to Duration on the Project Settings page.
3. Open the project in Open Workbench with read/write rights.
4. Save the Project back to Clarity.
Expected Result: Project is saved.
Actual Result: Error appears: "Unable to save project xxx. An exception occurred."
Workaround: Change the % Complete Calculation Method to anything but Duration or add a task to the project.
Status: This issue is currently under review as CLRT-76981.