Code Widget refactor; observable refactor

src/libs/singleton.py

@@ -15,8 +15,15 @@ class Singleton:
     _instance = None
 
     def __new__(cls, *args, **kwargs):
-        if cls._instance:
-            raise SingletonError(f"'{cls.__name__}' is a Singleton. Cannot create a new instance...")
+        if cls._instance is not None:
+            logger.debug(f"'{cls.__name__}' is a Singleton. Returning  instance...")
+            return cls._instance
 
         cls._instance = super(Singleton, cls).__new__(cls)
         return cls._instance
+
+    def __init__(self):
+        if self._instance is not None:
+            return
+
+        super(Singleton, self).__init__()