Error when creating issue in plan mode when Feedback is disabled

Summary of bug

If the feedback module is disabled, then when the user creates an issue in the planning mode of the board, there will be an error

Steps to reproduce

1. Disable the feedback module of GreenHopper
2. Access a Scrum board, and use the Plan mode
3. Create an issue
4. Issue will be created, but with the following error message :

Additional Findings

• Problem does not occur when in Work or Report mode
• Problem does not occur when creating issues in JIRA
• Problem does not occur if the Feedback module is enabled