Update DiaBLa.py

DiaBLa.py

@@ -162,7 +162,7 @@ class Diabla(datasets.GeneratorBasedBuilder):
                                       'final_evaluation_user1', 'final_evaluation_user2']
                  
                 for user in 'user1', 'user2':
-                    dialogue[user]['role_num'] = dialogue[user].get('role_num', dialogue[user]['rolenum'])
+                    dialogue[user]['role_num'] = dialogue[user].get('role_num', dialogue[user].get('rolenum', ''))
                     for info_to_remove in ['eval-stage', 'useragent', 'rolenum']:
                         if info_to_remove in dialogue[user]:
                             del dialogue[user][info_to_remove]