modify se failure reason

@@ -779,6 +779,7 @@ def se_compare_process(compare_info, ocr_res_dict):
                                     'errorType': '',
                                 }
                             )
+                        if len(failure_field) > 0:
                             failure_reason.setdefault(license_en, []).append('/'.join(failure_field))
         else:
             for license_en, field_list in info_value.items():
@@ -807,11 +808,12 @@ def se_compare_process(compare_info, ocr_res_dict):
                             'errorType': '',
                         }
                     )
+                if len(failure_field) > 0:
                     failure_reason.setdefault(license_en, []).append('/'.join(failure_field))
-    failure_reason_list = []
-    for license_en, failed_field_list in failure_reason.items():
-        failure_reason_list.append('{0}:{1}'.format(license_en, ';'.join(failed_field_list)))
-    failure_reason_str = '、'.join(failure_reason_list)
+    if failed_count == 0:
+        failure_reason_str = ''
+    else:
+        failure_reason_str = json.dumps(failure_reason)
     return compare_result, total_fields, failed_count, successful_at_this_level, failure_reason_str