CLOUDSTACK-5221:

In order to keep backward compatibility, listisos should return an empty response than an error when id of a removed iso is passed.

server/src/com/cloud/api/query/QueryManagerImpl.java

@@ -2850,7 +2850,7 @@ public class QueryManagerImpl extends ManagerBase implements QueryService {
 
         // verify templateId parameter and specially handle it
         if (templateId != null) {
-            template = _templateDao.findById(templateId);
+            template = _templateDao.findByIdIncludingRemoved(templateId); // Done for backward compatibility - Bug-5221
             if (template == null) {
                 throw new InvalidParameterValueException("Please specify a valid template ID.");
             }// If ISO requested then it should be ISO.