I am trying to use the Jira Python API to automatically add and remove issues. When adding, I was able to assign the epic link field (customfield_1006) to the name of an existing epic link, but when I try to remove the epic link by assigning it to an empty string, Jira throws an internal server error. I can remove the epic link through my browser, but I can't automate it through Python. Is there any way to remove an issue from an epic link using the API?