Bulk export button for saved queries doesn't perform any action about superset

[Maleware]

A little research later:

we found in this file /stackable/app/lib64/python3.9/site-packages/superset/queries/saved_queries/commands/export.py in class ExportSavedQueriesCommand the function def _export where the filename is build, that the model.schema is an optional field.

However, the code doesn't handle it properly and gives the None-Type into secure_filename which then throws an exception since it can't handle the None-Type:

2024-01-30 14:53:10,852:ERROR:flask_appbuilder.api:normalize() argument 2 must be str, not None                                                                          
Traceback (most recent call last):                                                                                                                                       
  File "/stackable/app/lib64/python3.9/site-packages/flask_appbuilder/api/__init__.py", line 110, in wraps                                                               
    return f(self, *args, **kwargs)                                                                                                                                      
  File "/stackable/app/lib64/python3.9/site-packages/superset/views/base_api.py", line 127, in wraps                                                                     
    raise ex                                                                                                                                                             
  File "/stackable/app/lib64/python3.9/site-packages/superset/views/base_api.py", line 121, in wraps                                                                     
    duration, response = time_function(f, self, *args, **kwargs)                                                                                                         
  File "/stackable/app/lib64/python3.9/site-packages/superset/utils/core.py", line 1526, in time_function                                                                
    response = func(*args, **kwargs)                                                                                                                                     
  File "/stackable/app/lib64/python3.9/site-packages/flask_appbuilder/api/__init__.py", line 182, in wraps                                                               
    return f(self, *args, **kwargs)                                                                                                                                      
  File "/stackable/app/lib64/python3.9/site-packages/superset/queries/saved_queries/api.py", line 271, in export                                                         
    for file_name, file_content in ExportSavedQueriesCommand(                                                                                                            
  File "/stackable/app/lib64/python3.9/site-packages/superset/commands/export/models.py", line 59, in run                                                                
    for file_name, file_content in self._export(model, self.export_related):                                                                                             
  File "/stackable/app/lib64/python3.9/site-packages/superset/queries/saved_queries/commands/export.py", line 45, in _export                                             
    schema_slug = model.schema                                                                                                                                           
  File "/stackable/app/lib64/python3.9/site-packages/werkzeug/utils.py", line 218, in secure_filename                                                                    
    filename = unicodedata.normalize("NFKD", filename)                                                                                                                   
TypeError: normalize() argument 2 must be str, not None