<fix>:Tf2MsgsTFMessageConverter::ConvertOutgoingMessage message nullptr.

[tiax615]

Can not send ROSMessages::tf2_msgs::TFMessage to ROS from UE. will throw an error of !bson_append_array_begin()

This is because the message is a null pointer and was not created properly.

[tsender]

Good catch. I must've missed that a while back when I refactored the message converters.

[aangert-anduril]

Oh Just saw this! I created a new PR as well

[Sanic]

Should be fixed by https://github.com/code-iai/ROSIntegration/pull/209/ Nevertheless: Thanks for the PR 🙂