Exceptions are not catched when using a websocket

[pjotterplotter]

It catches exceptions over http now #13 is resolved, but it is still swallows exceptions when subscribing / sending the query over a websocket:

app.mount("/graphql", graphql_app)
app.add_websocket_route("/graphql-ws", graphql_app)

Another suggestion would be to be able to mask the error details in the graphql response, so using logging getting the full error message, but return a generic error message over the graphql connection, so sensitive data cannot leak that way?