Raise error on no figures drawn

vis.py

@@ -46,6 +46,8 @@ def draw_figures(z_positions, dict_concs_mean, energy_list, frame_list, fig_rang
         if fig_range_str in fig_range_str_list:
             if fig_range_dict[fig_range_str] is not False:
                 fig_range_dict[fig_range_str] = sim_utilities.range_list_to_indexes(range_list, range(len(frame_list)))
+                if not fig_range_dict[fig_range_str]:
+                    raise IndexError(fig_range_str + " no frames selected")
 
     # ------------------------------
     # DRAWING FIGURES