Fix issue when config dir is created even if YOLO_CONFIG_DIR is set (#4054)

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

ultralytics/utils/__init__.py

@@ -568,9 +568,10 @@ def get_user_config_dir(sub_dir='Ultralytics'):
         raise ValueError(f'Unsupported operating system: {platform.system()}')
 
     # GCP and AWS lambda fix, only /tmp is writeable
-    if not is_dir_writeable(str(path.parent)):
+    if not is_dir_writeable(path.parent):
-        path = Path('/tmp') / sub_dir
+        LOGGER.warning(f"WARNING ⚠️ user config directory '{path}' is not writeable, defaulting to '/tmp' or CWD."
-        LOGGER.warning(f"WARNING ⚠️ user config directory is not writeable, defaulting to '{path}'.")
+                       'Alternatively you can define a YOLO_CONFIG_DIR environment variable for this path.')
+        path = Path('/tmp') / sub_dir if is_dir_writeable('/tmp') else Path().cwd() / sub_dir
 
     # Create the subdirectory if it does not exist
     path.mkdir(parents=True, exist_ok=True)
@@ -578,7 +579,7 @@ def get_user_config_dir(sub_dir='Ultralytics'):
     return path
 
 
-USER_CONFIG_DIR = Path(os.getenv('YOLO_CONFIG_DIR', get_user_config_dir()))  # Ultralytics settings dir
+USER_CONFIG_DIR = Path(os.getenv('YOLO_CONFIG_DIR') or get_user_config_dir())  # Ultralytics settings dir
 SETTINGS_YAML = USER_CONFIG_DIR / 'settings.yaml'