fix timeseries/masking
fix timeseries/masking

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