Merge pull request #20 from makeclean/serpent_mat_bug

Error in Serpent2 mat format

Author: makeclean

python/SerpentMaterialCard.py

@@ -10,6 +10,9 @@ def write_serpent_material(filestream, material):
     # if its a non tally material set the relevant colour
     if material.material_colour != 0:
         string += " rgb " + material.material_colour + "\n"
+    else:
+        string += "\n"
+        
     for nuc in material.composition_dictionary:
         string += '{} {:e} \n'.format(nuc, material.composition_dictionary[nuc])
     filestream.write(string)