hs_init(): cope with argc and/or argv being NULL (#6006)
hs_init(): cope with argc and/or argv being NULL (#6006)

MERGED from commit 4ca281829c70331571291ed3dcf813a6028cc904

ilyasergey/GHC-XAppFix,ilyasergey/GHC-XAppFix,ilyasergey/GHC-XAppFix,ilyasergey/GHC-XAppFix