Simplify conditional
Simplify conditional

`isOn` is known to be true at this point.

rgrempel/core,manleyjster/core,suryagaddipati/core,isaacsanders/core,martinos/core,ThomasWeiser/core,simonh1000/core,Pisys/core,rgrempel/core,ThomasWeiser/core,eeue56/core,krisajenkins/core,alexiamcdonald/elm-core,suryagaddipati/core,isaacsanders/core,manleyjster/core,bradurani/core,colinmccabe/core,vilterp/core,bradurani/core,rick68/core,laszlopandy/core,colinmccabe/core,vilterp/core,simonh1000/core,krisajenkins/core,Dandandan/core,Pisys/core,alexiamcdonald/elm-core,eeue56/core,martinos/core,laszlopandy/core,rick68/core,Dandandan/core