Loading QEC fails with internal server error

[tomasbbb]

Linux Ubuntu 16.04

1. Starting eIDAS bridge as a cotainer.
   Note: Werkzeug python library manually set to version 0.16.1 in requirements.demo.txt, otherwise docker does not start.
2. Go to http://localhost:5002/
3. Try load-qec "message": "Internal Server Error", console output:
   [2020-05-27 12:05:27,859] ERROR in app: Exception on /eidas/load-qec [POST]
   Traceback (most recent call last):
   File "/usr/local/lib/python3.7/dist-packages/flask/app.py", line 1950, in full_dispatch_request
   rv = self.dispatch_request()
   File "/usr/local/lib/python3.7/dist-packages/flask/app.py", line 1936, in dispatch_request
   return self.view_functionsrule.endpoint
   File "/usr/local/lib/python3.7/dist-packages/flask_restplus/api.py", line 325, in wrapper
   resp = resource(*args, **kwargs)
   File "/usr/local/lib/python3.7/dist-packages/flask/views.py", line 89, in view
   return self.dispatch_request(*args, **kwargs)
   File "/usr/local/lib/python3.7/dist-packages/flask_restplus/resource.py", line 44, in dispatch_request
   resp = meth(*args, **kwargs)
   File "/code/demo/eidas_bridge_api.py", line 50, in post
   request.json['password']
   File "/code/eidas_bridge/eidas_bridge.py", line 44, in eidas_load_qec
   dbmanager = DBManager()
   File "/code/eidas_bridge/utils/dbmanager.py", line 25, in init
   with open(self._file_path, 'w', newline='') as csvfile:
   FileNotFoundError: [Errno 2] No such file or directory: './demo/data/storage/eidas_data.csv'