safety try

main.py

@@ -28,9 +28,14 @@ def merge_week_keys_metadata(sheets):
             for month, days in months.items():
                 if month not in merged[day]:
                     merged[day][month] = []
+                
+                try:
                     for d in days:
                         if d not in merged[day][month]:
                             merged[day][month].append(d)
+                except Exception as e:
+                    traceback.print_exception(e)
+                    print(f"sheet_data.reader_info={sheet_data['reader_info']}; week_keys_metadata={wkm}")
     return merged
 
 def get_preferer_facultet(facultets_data: dict, excel_url: str, skip_for=None, ):