The Add Comment function still visible from the board even though the logged in user does not have the Add Comment permission

Summary

When a user views an issue on the board, the user can still able to see the Add Comment function even though the user does not have the Add Comment permission.

Environment

JIRA v1000.319.1
JIRA Agile v1000.38.1

Steps to Reproduce

1. Login as any user who has the permission to view Scrum board
2. Revoke the Add Comment permission from this user
3. Go to the Scrum board
4. Select any issue and it will be displayed at the right section
5. Click on Add Comment and add a text
6. Click on Add to add the comment
7. Error below will be displayed:

   • Communications Breakdown
     The JIRA server could not be contacted. This may be a temporary glitch or the server may be down.
     Close this dialog and press refresh in your browser 
     

• • From Developer Console:

Actual Results

The user can see the Add Comment button

Expected Results

The user should not be able to see the Add Comment function at the first place

Notes: The error message is somehow misleading and should be improved with an informational message.