Output is empty for some cases

[Yinghan-Li]

Output is empty when one of dims is 1, such as
` int dim[4] = {W, H, C, N};
int permutation[4] = {3, 0, 1, 2};

cuttHandle handle;
cuttPlan(&handle, 4, dim, permutation, sizeof(float), streamId);
cuttExecute(handle, in, out);
cuttDestroy(handle);`

Output is empty when W==1.

[DmitryLyakh]

cuTT does not allow dimension extents of 1.