Query error not handled with v3.0b7

Hello,

First of all thanks for developing Graphene, it is great to bring GraphQL to the Python world!

• What is the current behavior?

I am running the following code (coming from the Starlette docs) with Starlette, Uvicorn and Graphene v3.0b7:

from starlette.applications import Starlette
from starlette.routing import Route
from starlette.graphql import GraphQLApp
import graphene


class Query(graphene.ObjectType):
    hello = graphene.String(name=graphene.String(default_value="stranger"))

    def resolve_hello(self, info, name):
        return "Hello " + name


routes = [Route("/", GraphQLApp(schema=graphene.Schema(query=Query)))]

app = Starlette(routes=routes)

To run it I use:

uvicorn main:app

Then I send the following query:

query {
  foo
}

And instead of the error message, I get an Internal server error and the following traceback:

ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/uvicorn/protocols/http/h11_impl.py", line 394, in run_asgi
    result = await app(self.scope, self.receive, self.send)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/uvicorn/middleware/proxy_headers.py", line 45, in __call__
    return await self.app(scope, receive, send)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/applications.py", line 112, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/middleware/errors.py", line 181, in __call__
    raise exc from None
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/middleware/errors.py", line 159, in __call__
    await self.app(scope, receive, _send)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/exceptions.py", line 82, in __call__
    raise exc from None
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/exceptions.py", line 71, in __call__
    await self.app(scope, receive, sender)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/routing.py", line 582, in __call__
    await route.handle(scope, receive, send)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/routing.py", line 243, in handle
    await self.app(scope, receive, send)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/graphql.py", line 52, in __call__
    response = await self.handle_graphql(request)
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/graphql.py", line 105, in handle_graphql
    [format_graphql_error(err) for err in result.errors]
  File "/home/adrien/.virtualenvs/graphqlapp3/lib/python3.8/site-packages/starlette/graphql.py", line 105, in <listcomp>
    [format_graphql_error(err) for err in result.errors]
TypeError: 'NoneType' object is not callable

• What is the expected behavior?

With Graphene v2.1.8, the same query returns the expected error message:

{
  "data": null,
  "errors": [
    {
      "message": "Cannot query field \"foo\" on type \"Query\".",
      "locations": [
        {
          "line": 2,
          "column": 2
        }
      ]
    }
  ]
}

• Please tell us about your environment:

Here is my environment:

aniso8601==8.1.0
click==7.1.2
graphene==3.0b7
graphql-core==3.1.2
graphql-relay==3.0.0
h11==0.12.0
starlette==0.14.1
uvicorn==0.13.3

I am on Ubuntu 20.04

[Cito]

Starlett also references this in the docs, similar problem here.

[erikwrede]

Closing this issue due to lack of activity. If further problems occur using the new starlette-graphene3 extension, please open up an issue in that repo.