Disable system checks for graphql_schema management command (#939)

Author: millar

graphene_django/management/commands/graphql_schema.py

@@ -48,6 +48,7 @@ def add_arguments(self, parser):
 class Command(CommandArguments):
     help = "Dump Graphene schema as a JSON or GraphQL file"
     can_import_settings = True
+    requires_system_checks = False
 
     def save_json_file(self, out, schema_dict, indent):
         with open(out, "w") as outfile: