mara_gripper_hande.launch.py failing

[nzlz]

Bug report

Required Info:

• Operating System:
  Ubuntu18
• ROS and ROS2 versions:
  ROS2 Crystal
• Failing component:
  Gazebo RobotiqLinearPlugin.cpp:203

Steps to reproduce issue

ros2 launch mara_gazebo mara_gripper_hande.launch.py

Trace:

[Err] [RobotiqLinearPlugin.cpp:203] EXCEPTION: Could not find finger1_joint left joint

[Err] [Model.cc:1129] Exception occured in the Load function of plugin with name[robotiq_hande_gripper] and filename[librobotiq_linear_gripper_gazebo_plugin.so]. This plugin will not run.

[vmayoral]

Thanks for reporting @nzlz, @ahcorde mind having a look at this?

[ahcorde]

fixed 8836ca9