should a case be thrown out of court if the arresting officer is imprisoned and doesn't appear in court for the case?

A friend went to court & the arresting officer didnt appear due to the fact that he was imprisoned himself. He wants to know if the case should have been thrown out & if so what can he can do now to change the results of his case. He was charged with a traffic violation & given 2 years probation & I think another charge. The judge said something about a habeas corpes, is this something he can file & would it be worth it? He also feels like his attorney didnt work for him