fix: make task index not crash. It looks like the task.index.html page was a copy of bug.index.html. However some fields are missing from a task that is in a bug. This causes a crash when looking at all tasks if you don't explicitly select the fields to be displayed. The task links from the sidebar do explicitly select @columns fields, so the crash is not normally seen.

def audit_html_files(db, cl, nodeid, newvalues):
    if 'type' in newvalues and newvalues['type'] == 'text/html':
        newvalues['type'] = 'text/plain'
    

def init(db):
    db.file.audit('set', audit_html_files)
    db.file.audit('create', audit_html_files)