Unable to edit comments when attachments are disabled

Summary

It is not possible to edit a JIRA Service Desk comment when attachments are disabled in the JIRA Core settings.

Environment

• JIRA Core 7.2.x
• JIRA Service Desk 3.2.x

Steps to Reproduce

1. Disable file attachments - Configuring file attachments.
2. Add a comment to a Service Desk enabled project.
3. Try to edit the comment.
4. Click on either 'Share with customer' or 'Add to issue only'.

Expected Results

Editing the comment works and the comment is saved.

Actual Results

A red banner is displayed with the error:

Failed to attach files

You do not have permission to create attachments for this issue.

The warning below is written to the standard Tomcat log (e.g. catalina.out) file:

11-Oct-2016 16:57:18.155 WARNING [http-nio-8721-exec-17] com.sun.jersey.spi.container.servlet.WebComponent.filterFormParameters A servlet request, to the URI http://jira.baseurl/rest/jddap/1.0/attachment, contains form parameters in the request body but the request body has been consumed by the servlet or a servlet filter accessing the request parameters. Only resource methods using @FormParam will work as expected. Resource methods consuming the request body by other means will not work as expected.

Notes

Creating and deleting comments work as expected.

Workaround

Enable file attachments before editing the comments.