Don't agree with that. Being told to fly an unpublished pattern is not uncommon in many parts of the world. If you are told to hold at a reporting point and there is no hold published on your charts, you default to standard PANSOPS (or TERPS if appropriate). You don't ask,
"How do you want me to hold as I don't have a hold published and I'm asking because there is a possibilty that my approach charts may be wrong".
Incidently, the DESDI hold is published on the radar vectoring chart on the Jepps and not on the STAR - which is the chart a pilot will have clipped to his control column. Also, the hold defaults to standard in our aircraft's FMC - the database is produced by Jeppesson. This could be why pilots new to Dubai fly RH holds at DESDI. May I suggest that someone in your organisation contacts Jeppesson suggesting they amend their charts and database. I will do it at my end, a double pronged attack would work best.
We did contact SAS about their charts having filed an ASR, but got no response.