CreateIssueDetails URL does not fill in default value for Reporter field when user has Modify Reporter permissions

This may be a duplicate of JRA-12984 but I'm raising it separately just in case it isn't.

When a user with Modify Reporter permissions uses a stored CreateIssueDetails link with default field values to create a new issue, we see the following behaviour:

1. if reporter is set in URL - create issue screen has reporter field set to specified person - good
2. if reporter is not set in URL - create issue screen has reporter field blank - bad
   (Example of CreateIssueDetails URL:
   http://product-jira.ciena.com/secure/CreateIssueDetails!init.jspa?pid=10031&issuetype=13&customfield_10017=3&customfield_10116=203)

The Create Issue screen you get from using a CreateIssueDetails link should behave the same as the Create Issue screen you get from clicking on Create Issue - the reporter field should default to the current user if not specified in the URL.