fix(integrations): Handle None-value in GraphQL query

Gracefully handle an empty GraphQL query.

Fixes getsentry#2715

sentry_sdk/integrations/strawberry.py

@@ -145,6 +145,9 @@ def on_operation(self):
         operation_type = "query"
         op = OP.GRAPHQL_QUERY
 
+        if self.execution_context.query is None:
+            self.execution_context.query = ""
+
         if self.execution_context.query.strip().startswith("mutation"):
             operation_type = "mutation"
             op = OP.GRAPHQL_MUTATION

tests/integrations/strawberry/test_strawberry_py3.py

@@ -591,3 +591,30 @@ def test_transaction_mutation(
         "graphql.field_path": "Mutation.change",
         "graphql.path": "change",
     }
+
+
+@parameterize_strawberry_test
+def test_handle_none_query_gracefully(
+    request,
+    sentry_init,
+    capture_events,
+    client_factory,
+    async_execution,
+    framework_integrations,
+):
+    sentry_init(
+        integrations=[
+            StrawberryIntegration(async_execution=async_execution),
+        ]
+        + framework_integrations,
+    )
+    events = capture_events()
+
+    schema = strawberry.Schema(Query)
+
+    client_factory = request.getfixturevalue(client_factory)
+    client = client_factory(schema)
+
+    client.post("/graphql", json={})
+
+    assert len(events) == 0, "expected no events to be sent to Sentry"