'Shahs of Sunset' Slams FHM Model -- Mattel Owns 'Barbie', Duh!

"Shahs of Sunset" producers want to school an FHM model on the law -- telling her she has no right to sue over her handle "Persian Barbie" ... because Mattel trademarked the name a looong time ago!!TMZ broke the story ... Persian model Niki Ghazian…