Add parameter to ignore missing SIMPLE
Add parameter to ignore missing SIMPLE

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