EVE-NG remove/hide unused node templates

DerMeldos

Modify the following file:

/opt/unetlab/html/includes/init.php

from:

if ( $found == 0 )  {
                        //$node_templates[$templ] = $desc.'.missing'  ;
                        $node_templates[$templ] = $desc.TEMPLATE_DISABLED  ;
                }

To:

if ( $found == 0 )  {
                        //$node_templates[$templ] = $desc.'.missing'  ;
                        unset($node_templates[$templ]);
                        //$node_templates[$templ] = $desc.TEMPLATE_DISABLED  ;
                }