root Query type doesn't initialize fields correctly, fields with default_factory are unininitialized

[devkral]

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Describe the Bug

Here a code example

@strawberry.type
class Sub:
    @strawberry.field
    def foo(self) -> str:
        return "bar"

@strawberry.type
class Query:
    sub: Sub = strawberry.field(default_factory=Sub)

schema = strawberry.Schema(query=Query)

# this fails
result = schema.execute_sync(
    """
    query TestQuery{
        sub {
            foo
        }
    }
    """
)

Solution: initialize also the root schema or provide a fallback for None in get_result

System Information

• Operating system:
• Strawberry version (if applicable):

Additional Context

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[devkral]

as the source is somewhere defined outside of strawberry, None must be handled