stages/noop: fix whitespaces

Be more like PEP-8 and use two newlines where needed.

stages/org.osbuild.noop

@@ -10,13 +10,16 @@ leaves the tree untouched. Useful for testing, debugging, and wasting time.
 import json
 import sys
 
+
 SCHEMA = """
 "additionalProperties": true
 """
 
+
 def main(_tree, options):
     print("Not doing anything with these options:", json.dumps(options))
 
+
 if __name__ == '__main__':
     args = json.load(sys.stdin)
     r = main(args["tree"], args.get("options", {}))