ConfigHub: re-initialize ChainMap.maps as a list of ConfigObj. Re #155.

Mypy: re-initialize ChainMap.maps as a list of ConfigObj. This complies with ChainMap specification in that maps is a list of mappings, and ConfigObj, as a dictionary/section, is indeed a mapping. To acknowledge that ConfigHub is powered by ChainMap, call super method, and then re-initialize self.maps. This resolves attribute definition errors from Mypy when accessing ConfigObj attributes.

addon/appModules/splstudio/splconfig.py

@@ -88,7 +88,10 @@ def __init__(self, splComponent: Optional[str] = None) -> None:
 		if splComponent not in _SPLComponents_:
 			raise RuntimeError("Not a StationPlaylist component, cannot create SPL add-on Config Hub database")
 		# Create a "fake" map entry, to be replaced by the normal profile later.
+		# Super method is called to acknowledge the fact that this is powered by ChainMap.
 		super(ConfigHub, self).__init__()
+		# #155 (21.03): re-initialize maps to be a list of config objects to satisfy Mypy and friends.
+		self.maps: list[ConfigObj] = [{}]
 		# #64 (18.07): keep an eye on which SPL component opened this map.
 		self.splComponents = set()
 		self.splComponents.add(splComponent)