fixes? compile errors
fixes? compile errors

 possibly fixes #77 issue where the API was not compiling. I added a null conditional to the datatype of impactvelocity as the vector3 datatype for impact position already had one as well and they should behave the same. I am not sure if this is the correct approach to fixing it or not. I can't seem to get KSP to run my solution of trajectories even after it compiles and can't figure out why.
Kerbas-ad-astra/KSPTrajectories