[ci] Try this too

python/example_robot_data/robots_loader.py

@@ -45,6 +45,7 @@ def addFreeFlyerJointLimits(robot):
 
 
 def loadANYmal(withArm=None):
+    REF_POSTURE = str()
     if withArm is None:
         URDF_FILENAME = "anymal.urdf"
         SRDF_FILENAME = "anymal.srdf"