Don't attempt to start dashboard_client when use_fake_hardware is true (#486)

Author: fmauch

ur_bringup/launch/ur_control.launch.py

@@ -16,7 +16,7 @@
 
 from launch import LaunchDescription
 from launch.actions import DeclareLaunchArgument
-from launch.conditions import IfCondition
+from launch.conditions import IfCondition, UnlessCondition
 from launch.substitutions import Command, FindExecutable, LaunchConfiguration, PathJoinSubstitution
 from launch_ros.actions import Node
 from launch_ros.substitutions import FindPackageShare
@@ -236,6 +236,7 @@ def generate_launch_description():
 
     dashboard_client_node = Node(
         package="ur_robot_driver",
+        condition=UnlessCondition(use_fake_hardware),
         executable="dashboard_client",
         name="dashboard_client",
         output="screen",