fix - cohort contacts are now built correctly

metadata_tools/importxls/dish_xls_exporter.py

@@ -81,7 +81,7 @@ class DishXlsExporter:
                                    }
 
                     if sheet[12, 1] and sheet[15, 1]:
-                        cohort_dict["contacts"] = cohort_dict["contacts"].append({"first_name": get_names_from_string(sheet[12,1])[0],
+                        cohort_dict["contacts"].append({"first_name": get_names_from_string(sheet[12,1])[0],
                                                                                   "last_name": get_names_from_string(sheet[12,1])[1],
                                                                                   "role": sheet[15,1],
                                                                                   "email":sheet[13,1],