message: Fix dr.unravel for tensor input
diff: @@ -1112,6 +1112,8 @@ def unravel(dtype, array, order='F'):
  t = t.Value
  index_type = _dr.uint32_array_t(t)
  + array = array if not _dr.is_tensor_v(array) else array.array
  +
  if len(array) % size != 0:
  raise Exception('unravel(): input array length must be '
  'divisible by %i!' % size)
  