Generalise exception handling

ref-test/app/tools/data.py

@@ -78,7 +78,7 @@ def check_dataset_exists(function):
     @wraps(function)
     def wrapper(*args, **kwargs):
         try: datasets = Dataset.query.all()
-        except (SQLAlchemyError, ConnectionError) as exception:
+        except Exception as exception:
             write('system.log', f'Database error when checking existing datasets: {exception}')
             return abort(500)
         if not datasets: