Set invalid to True for graphql.core.graphql()

Author: dittos

graphql/core/__init__.py

@@ -10,8 +10,8 @@ def graphql(schema, request='', root=None, vars=None, operation_name=None):
     validation_errors = validate(schema, ast)
     if validation_errors:
         return ExecutionResult(
-            data=None,
             errors=validation_errors,
+            invalid=True,
         )
     return execute(
         schema,

graphql/core/execution/base.py

@@ -66,7 +66,7 @@ class ExecutionResult(object):
     query, `errors` is null if no errors occurred, and is a
     non-empty array if an error occurred."""
 
-    def __init__(self, data, errors=None, invalid=False):
+    def __init__(self, data=None, errors=None, invalid=False):
         self.data = data
         self.errors = errors
         if invalid: