fix(targetticket): empty dropdown for target ticket linking"

Signed-off-by: Thierry Bugier <tbugier@teclib.com>

Author: btry

inc/targetbase.class.php

@@ -232,6 +232,10 @@ public static function getEnumLocationRule() {
       ];
    }
 
+   public function isEntityAssign() {
+      return false;
+   }
+
    /**
     * get the associated form
     */