Crucible does not render Assignee field properly.

Summary

When setting up an Application Link between JIRA and Crucible, then try to reopen an already closed issue from Crucible if there is the Assignee field in a screen, the field drop-down won't be render when transitioning the issue from Crucible.

Steps to reproduce

1. Create an Application Link between JIRA and Crucible.
2. In JIRA create a test Project.
3. Use the workflow "classic default workflow" in this project, which has the assignee field in the screens of the transitions.
4. Create a test issue, and close the issue.
5. In Crucible, create a new review linking to this test issue.
6. Open the closed issue in Crucible, and try to transition the issue clicking in "Reopen"
7. It will bring the screen with the assignee field, however, there is a drop-down that doesn't render properly.

It appears that any transition containing the Assignee field in a screen will not render that field.

Expected behaviour

Render the Assignee field with the possible options to reassign the issue.

Actual Results

The assignee field drop down does not render properly

Workaround

Remove the field from the screens in the transitions, or simply press enter when performing the transition, the issue will be transitioned without changing the Assignee field.

Note

Reporter field is also affected