added error checking to the threads in estimate_threaded
added error checking to the threads in estimate_threaded

jackdawjackdaw/emulator,jackdawjackdaw/emulator,jackdawjackdaw/emulator,MADAI/MADAIEmulator,MADAI/MADAIEmulator,MADAI/MADAIEmulator,MADAI/MADAIEmulator,jackdawjackdaw/emulator