If no map has been generated yet, an internal server error occurs when trying to upload a sketch map

[mhhd2020]

A fitting error message should be shown instead.

Traceback:

ERROR:sketch_map_tool:Exception on /digitize/results [POST]
sketch-map-tool-flask-1     | Traceback (most recent call last):
sketch-map-tool-flask-1     |   File "/home/smt/.cache/pypoetry/virtualenvs/sketch-map-tool-7oog9W5A-py3.10/lib/python3.10/site-packages/flask/app.py", line 2528, in wsgi_app
sketch-map-tool-flask-1     |     response = self.full_dispatch_request()
sketch-map-tool-flask-1     |   File "/home/smt/.cache/pypoetry/virtualenvs/sketch-map-tool-7oog9W5A-py3.10/lib/python3.10/site-packages/flask/app.py", line 1825, in full_dispatch_request
sketch-map-tool-flask-1     |     rv = self.handle_user_exception(e)
sketch-map-tool-flask-1     |   File "/home/smt/.cache/pypoetry/virtualenvs/sketch-map-tool-7oog9W5A-py3.10/lib/python3.10/site-packages/flask/app.py", line 1823, in full_dispatch_request
sketch-map-tool-flask-1     |     rv = self.dispatch_request()
sketch-map-tool-flask-1     |   File "/home/smt/.cache/pypoetry/virtualenvs/sketch-map-tool-7oog9W5A-py3.10/lib/python3.10/site-packages/flask/app.py", line 1799, in dispatch_request
sketch-map-tool-flask-1     |     return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
sketch-map-tool-flask-1     |   File "/opt/smt/sketch_map_tool/routes.py", line 114, in digitize_results_post
sketch-map-tool-flask-1     |     map_frame_buffer = BytesIO(db_client_flask.select_map_frame(UUID(uuid)))
sketch-map-tool-flask-1     |   File "/opt/smt/sketch_map_tool/database/client_flask.py", line 144, in select_map_frame
sketch-map-tool-flask-1     |     curs.execute(query, [str(uuid)])
sketch-map-tool-flask-1     | psycopg2.errors.UndefinedTable: relation "map_frame" does not exist
sketch-map-tool-flask-1     | LINE 1: SELECT file FROM map_frame WHERE uuid = '01127aff-59a0-4aad-...