Script workflow function : Clones an issue and links in a workflow - without attachments

[Daniel Kim]

JIRA server: 7.3.8

Adaptavist ScriptRunner for JIRA: 5.3.9

Using ScriptRunner workflow function to clone/link an issue. I have below codes in [Additional issue actions] to avoid attachments to be cloned. however it doesn't seem to be working. 

Anything I can try? 

checkAttachment = {attachment -> false};

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.MutableIssue

def user = ComponentAccessor.getUserManager().getUserByName('jeff.fulton')
issue.setAssignee(user)