Revert A1 description to original

Author: stephane-caron

robot_descriptions/a1_description.py

@@ -6,19 +6,16 @@
 
 """A1 description."""
 
-import os
+from os import getenv as _getenv
+from os import path as _path
 
 from ._cache import clone_to_cache as _clone_to_cache
 
 REPOSITORY_PATH: str = _clone_to_cache(
     "unitree_ros",
-    commit=(
-        os.environ.pop("ROBOT_DESCRIPTION_COMMIT")
-        if "ROBOT_DESCRIPTION_COMMIT" in os.environ
-        else None
-    ),
+    commit=_getenv("ROBOT_DESCRIPTION_COMMIT", None),
 )
 
-PACKAGE_PATH: str = os.path.join(REPOSITORY_PATH, "robots", "a1_description")
+PACKAGE_PATH: str = _path.join(REPOSITORY_PATH, "robots", "a1_description")
 
-URDF_PATH: str = os.path.join(PACKAGE_PATH, "urdf", "a1.urdf")
+URDF_PATH: str = _path.join(PACKAGE_PATH, "urdf", "a1.urdf")