Make sure in log that adding handlers only works before logging is initialized

For future: if we add handlers later, the queue / logger must be re-intialized

src/corelibs/logging_handling/log.py

@@ -126,6 +126,7 @@ class Log:
 
         self.log_queue: 'Queue[str] | None' = None
         self.listener: logging.handlers.QueueListener | None = None
+        self.logger: logging.Logger | None = None
 
         # setup handlers
         # NOTE if console with color is set first, some of the color formatting is set
@@ -219,6 +220,10 @@ class Log:
         """
         if self.handlers.get(handler_name):
             return False
+        if self.listener is not None or self.logger is not None:
+            raise ValueError(
+                f"Cannot add handler {handler_name}: {handler.get_name()} because logger is already running"
+            )
         # TODO: handler must be some handler type, how to check?
         self.handlers[handler_name] = handler
         return True
@@ -360,6 +365,8 @@ class Log:
             *args (object): arguments for msg
             extra: Mapping[str, object] | None: extra arguments for the formatting if needed
         """
+        if self.logger is None:
+            raise ValueError('Logger is not yet initialized')
         self.logger.log(LoggingLevel.EXCEPTION.value, msg, *args, exc_info=True, extra=extra)
 
     # MARK: break line
@@ -370,6 +377,8 @@ class Log:
         Keyword Arguments:
             info {str} -- _description_ (default: {"BREAK"})
         """
+        if self.logger is None:
+            raise ValueError('Logger is not yet initialized')
         self.logger.info("[%s] %s>", info, self.SPACER_CHAR * self.SPACER_LENGTH)
 
     # MARK: queue handling
@@ -432,13 +441,15 @@ class Log:
             self.handlers[handler_name].setLevel(log_level.name)
             return True
         except IndexError:
-            self.logger.error('Handler %s not found, cannot change log level', handler_name)
+            if self.logger:
+                self.logger.error('Handler %s not found, cannot change log level', handler_name)
             return False
         except AttributeError:
-            self.logger.error(
-                'Cannot change to log level %s for handler %s, log level invalid',
-                LoggingLevel.name, handler_name
-            )
+            if self.logger:
+                self.logger.error(
+                    'Cannot change to log level %s for handler %s, log level invalid',
+                    LoggingLevel.name, handler_name
+                )
             return False
 
     def get_log_level(self, handler_name: str) -> LoggingLevel: