fix for -E

fslstats.cc

@@ -256,6 +256,10 @@ int fmrib_main_float(int argc, char* argv[])
       ColumnVector hist;
       int nbins=1000;
       double entropy=0;
+      if (mask.nvoxels()<1) {
+	generate_masks(mask,masknz,vol,lthr,uthr); 
+	vol*=mask; 
+      }
       hist = vol.histogram(nbins,masknz);
       double ntot = hist.Sum();
       for (int j=1; j<=nbins; j++) {