perf: use None for empty lists

Replicates graphql/graphql-js@92f9bb0

Author: Cito

docs/conf.py

@@ -192,6 +192,7 @@
     "graphql.execution.collect_fields.CollectedFields",
     "graphql.execution.collect_fields.DeferUsage",
     "graphql.execution.collect_fields.FieldDetails",
+    "graphql.execution.execute.GraphQLWrappedResult",
     "graphql.execution.execute.IncrementalContext",
     "graphql.execution.execute.StreamArguments",
     "graphql.execution.execute.SubFieldPlan",

pyproject.toml

@@ -275,6 +275,7 @@ disallow_untyped_defs = false
 [tool.pyright]
 # silence pyright since we're using mypy already
 reportArgumentType = false
+reportAssignmentType = false
 reportAttributeAccessIssue = false
 reportIncompatibleVariableOverride = false
 reportInvalidTypeForm = false

src/graphql/error/graphql_error.py

@@ -151,7 +151,7 @@ def __init__(
         self.source = source
         if not source and node_locations:
             loc = node_locations[0]
-            if loc.source:  # pragma: no cover else
+            if loc.source:  # pragma: no branch
                 self.source = loc.source
         if not positions and node_locations:
             positions = [loc.start for loc in node_locations]

src/graphql/execution/__init__.py

@@ -13,6 +13,7 @@
     default_type_resolver,
     subscribe,
     ExecutionContext,
+    GraphQLWrappedResult,
     Middleware,
 )
 from .incremental_publisher import (
@@ -44,6 +45,7 @@
     "FormattedIncrementalStreamResult",
     "FormattedInitialIncrementalExecutionResult",
     "FormattedSubsequentIncrementalExecutionResult",
+    "GraphQLWrappedResult",
     "IncrementalDeferResult",
     "IncrementalResult",
     "IncrementalStreamResult",

src/graphql/execution/collect_fields.py

@@ -223,7 +223,7 @@ def collect_fields_impl(
                     new_defer_usages,
                     new_defer_usage,
                 )
-        elif isinstance(selection, FragmentSpreadNode):  # pragma: no cover else
+        elif isinstance(selection, FragmentSpreadNode):  # pragma: no branch
             frag_name = selection.name.value
 
             new_defer_usage = get_defer_usage(