[FIX] Set length to 1 when np.squeeze returns a 0D array

Author: man-shu

nipype/algorithms/misc.py

@@ -1495,7 +1495,11 @@ def merge_rois(in_files, in_idxs, in_ref, dtype=None, out_file=None):
             for d, fname in enumerate(nii):
                 data = np.asanyarray(nb.load(fname).dataobj).reshape(-1)
                 cdata = nb.load(cname).dataobj[..., d].reshape(-1)
-                nels = len(idxs)
+                try:
+                    nels = len(idxs)
+                except TypeError:
+                    nels = 1
+
                 idata = (idxs,)
                 data[idata] = cdata[0:nels]
                 nb.Nifti1Image(data.reshape(rsh[:3]), aff, hdr).to_filename(fname)