Fix ConfigManagingActor crash when any file was deleted

`event.path.samefile` raises error if:
 * `event.pathq` doesn't exists
 * path `p` doesn't exists
In this case it raised exception if any file in parent
directory was deleted.

Signed-off-by: Elzbieta Kotulska <[email protected]>

Author: ela-kotulska-frequenz

src/frequenz/sdk/config/_config_managing.py

@@ -164,6 +164,15 @@ async def _run(self) -> None:
 
         try:
             async for event in file_watcher:
+                if event.type == EventType.DELETE:
+                    if event.path in self._config_paths:
+                        _logger.info(
+                            "%s: The configuration file %s was deleted, ignoring...",
+                            self,
+                            event.path,
+                        )
+                    continue
+
                 # Since we are watching the whole parent directories, we need to make
                 # sure we only react to events related to the configuration files we
                 # are interested in.
@@ -185,12 +194,6 @@ async def _run(self) -> None:
                             event.path,
                         )
                         await self.send_config()
-                    case EventType.DELETE:
-                        _logger.info(
-                            "%s: The configuration file %s was deleted, ignoring...",
-                            self,
-                            event.path,
-                        )
                     case _:
                         assert_never(event.type)
         finally: