Merge branch 'master' into feature/rebased_pluggable_ee

stretch_core/nodes/stretch_driver

@@ -151,7 +151,7 @@ class StretchBodyNode:
         # add gripper joints to joint state
         gripper_cg = self.joint_trajectory_action.gripper_cg
         if gripper_cg is not None:
-            missing_gripper_joint_names = list(set([gripper_cg.gripper_joint_names]) - set(joint_state.name))
+            missing_gripper_joint_names = list(set(gripper_cg.gripper_joint_names) - set(joint_state.name))
             for j in missing_gripper_joint_names:
                 pos, vel, effort = gripper_cg.joint_state(robot_status, joint_name=j)
                 joint_state.name.append(j)