fix when no .x field

matlab/AUG/rdaAUG_eff.m

@@ -476,7 +476,7 @@ end
 adata.value = adata.data;
 
 % make sure orientation of .x maps 1st 2 dims if 2D
-if sum([size(adata.x)~=1]) == 2 && sum([size(adata.data)~=1]) >= 2
+if isfield(adata,'x') && ~isempty(adata.x) && sum([size(adata.x)>1]) == 2 && sum([size(adata.data)>1]) >= 2
   if size(adata.x,1)==size(adata.data,2) && size(adata.x,2)==size(adata.data,1)
     adata.x = adata.x';
     if isfield(adata,'dim')