Fix examples that rely on default good_mask_value
Fix examples that rely on default good_mask_value

StuartLittlefair/astropy,astropy/astropy,astropy/astropy,aleksandr-bakanov/astropy,pllim/astropy,mhvk/astropy,bsipocz/astropy,StuartLittlefair/astropy,mhvk/astropy,lpsinger/astropy,pllim/astropy,lpsinger/astropy,MSeifert04/astropy,larrybradley/astropy,saimn/astropy,larrybradley/astropy,pllim/astropy,larrybradley/astropy,larrybradley/astropy,bsipocz/astropy,saimn/astropy,mhvk/astropy,mhvk/astropy,saimn/astropy,pllim/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,lpsinger/astropy,saimn/astropy,aleksandr-bakanov/astropy,astropy/astropy,dhomeier/astropy,stargaser/astropy,StuartLittlefair/astropy,stargaser/astropy,pllim/astropy,MSeifert04/astropy,MSeifert04/astropy,lpsinger/astropy,bsipocz/astropy,dhomeier/astropy,larrybradley/astropy,StuartLittlefair/astropy,astropy/astropy,dhomeier/astropy,mhvk/astropy,bsipocz/astropy,stargaser/astropy,MSeifert04/astropy,stargaser/astropy,saimn/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,StuartLittlefair/astropy,astropy/astropy