don't try and apply space motion if no velocity present
don't try and apply space motion if no velocity present

don't try and apply space motion if no velocity present

don't try and apply space motion if no velocity present

pllim/astropy,lpsinger/astropy,pllim/astropy,astropy/astropy,larrybradley/astropy,dhomeier/astropy,dhomeier/astropy,larrybradley/astropy,lpsinger/astropy,larrybradley/astropy,pllim/astropy,larrybradley/astropy,dhomeier/astropy,saimn/astropy,lpsinger/astropy,StuartLittlefair/astropy,dhomeier/astropy,saimn/astropy,astropy/astropy,mhvk/astropy,aleksandr-bakanov/astropy,saimn/astropy,pllim/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,saimn/astropy,mhvk/astropy,mhvk/astropy,aleksandr-bakanov/astropy,mhvk/astropy,saimn/astropy,StuartLittlefair/astropy,pllim/astropy,astropy/astropy,StuartLittlefair/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,astropy/astropy,lpsinger/astropy,astropy/astropy,lpsinger/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,mhvk/astropy