Update linkgraph.php
Update linkgraph.php

linkgraph.php errored if the link ID had an underscore in it.
JackSlateur/AS-Stats,manuelkasper/AS-Stats,manuelkasper/AS-Stats,clobrother/AS-Stats,JackSlateur/AS-Stats,clobrother/AS-Stats,clobrother/AS-Stats,JackSlateur/AS-Stats,clobrother/AS-Stats,manuelkasper/AS-Stats,JackSlateur/AS-Stats,manuelkasper/AS-Stats