(Reuters) Remember the story of the Mayer Brown paralegal mistake that could cost GM lenders $1.5 billion? Now there’s a new development in the clawback litigation spurred by that fatal error. Creditors of the pre-bankruptcy GM are alleging that an Oaktree fund found a brazen way to sidestep their demand for the return of their money: The fund shut itself down before a court could decide whether it must pay back about $50 million.