Make global objects not Optional

This reflects reality, despite the default values of the code.
We still need a better solution (singleton?).

poezio/config.py

@@ -679,7 +679,7 @@ LOGGING_CONFIG = {
 firstrun = False
 
 # Global config object. Is setup in poezio.py
-config = None  # type: Optional[Config]
+config = None  # type: Config
 
 # The logger object for this module
 log = None  # type: Optional[logging.Logger]

poezio/logger.py

@@ -306,4 +306,4 @@ def create_logger() -> None:
     logger = Logger()
 
 
-logger = None  # type: Optional[Logger]
+logger = None  # type: Logger