Fix simple test example

Author: tekktrik

examples/logging_simpletest.py

@@ -11,6 +11,8 @@
 # This should produce an error output
 
 logger = logging.getLogger("test")
+print_logger = logging.StreamHandler()
+logger.addHandler(print_logger)
 
 logger.setLevel(logging.ERROR)
 logger.info("Info message")
@@ -19,7 +21,8 @@
 # This should produce no output
 
 null_logger = logging.getLogger(None)
-null_logger.addHandler(logging.NullHandler)
+null_handler = logging.NullHandler()
+null_logger.addHandler(null_handler)
 
 null_logger.setLevel(logging.ERROR)
 null_logger.info("Info message")