Inconsistent function return values

[engn33r]

While fixing mypy errors, the following inconsistencies in function return values were found:

• handleDisconnect() in _app.py is missing a return statement
• extract_error_code() in _utils.py is missing a return statement if the branching logic is not entered
• read() in _app.py expects a return value from timeout() (which is declared in multiple locations)
• read() in _app.py expects teardown() to return a bool
• _send() and _recv() in _socket.py only return a value if a logic branch is entered

The errors were detected using mypy websocket --no-strict-optional