Fixes for content checksum and torrent pieces backfill

Remove null handler from app.py, was silencing other logs

app.py

@@ -106,9 +106,6 @@ class InjectingFilter(logging.Filter):
 
 root_logger = logging.getLogger()
 
-# Add a null handler to the root logger to silence missing handler errors in tests
-root_logger.addHandler(logging.NullHandler())
-
 # Add the request id filter to all handlers of the root logger
 for handler in root_logger.handlers:
   handler.addFilter(InjectingFilter())