avoid calling __bool__ in unpack_remotedata
avoid calling __bool__ in unpack_remotedata

This was triggering long local dask computations

dask/distributed,blaze/distributed,dask/distributed,amosonn/distributed,mrocklin/distributed,mrocklin/distributed,dask/distributed,dask/distributed,amosonn/distributed,broxtronix/distributed,amosonn/distributed,broxtronix/distributed,blaze/distributed,mrocklin/distributed,broxtronix/distributed