Plugin breaks issue rest api for current redmine trunk

[pulse00]

It seems the subtask plugin breaks the issue rest api for redmine:

http://www.redmine.org/issues/show/4795

myredmineapp.com/issues.xml should return a valid xml, instead it returns some html page. myredmineapp.com/projects.xml however, returns a valid xml.

When removing the plugin, the issue rest api works correctly again.

I'm running the current trunk of redmine, and HEAD of the plugins master branch.