fix Crash node if easy_fleet creation fails (#159)

* fix Crash node if easy_fleet creation fails

Upon creation of the EasyFullControl object the node may keep running even tho the returned pointer is null

Signed-off-by: thomasung <thomas.ung@pal-robotics.com>

lint

Signed-off-by: thomasung <thomas.ung@pal-robotics.com>

* rephrase comments

Signed-off-by: thomasung <thomas.ung@pal-robotics.com>

follow pycodestyle

Signed-off-by: Thomas Ung <tomkimsour@hotmail.fr>

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Signed-off-by: thomasung <thomas.ung@pal-robotics.com>
Signed-off-by: Thomas Ung <tomkimsour@hotmail.fr>

free_fleet_adapter/free_fleet_adapter/fleet_adapter.py

@@ -134,6 +134,9 @@ def main(argv=sys.argv):
         fleet_config.add_robot_coordinates_transformation(level, tf)
 
     fleet_handle = adapter.add_easy_fleet(fleet_config)
+    assert fleet_handle is not None, \
+        "Failed to create EasyFullControl fleet, \
+        please verify that the fleet config is valid."
 
     # Initialize zenoh
     zenoh_config = zenoh.Config.from_file(args.zenoh_config) \