BUG: fixes get_instance_attributes for Flight objects containing a Rocket object without rail buttons#786

leogrosa merged 5 commits intodevelopRocketPy-Team/RocketPy:developfrom

bug/flight-without-rail-buttons-crash-on-get-instance-attributesRocketPy-Team/RocketPy:bug/flight-without-rail-buttons-crash-on-get-instance-attributesCopy head branch name to clipboard