2bae64741264ff477a76df8bf2f922701f9f09b4

Author:
Zalim Bashorov (Zalim.Bashorov@jetbrains.com) at 6/4/13 2:06 PM

Make nullable check less verbose in JS-backend. For check what variable is equal null or undefined enough to compare with null (or undefined). See ECMAScript specification 11.9.1, 11.9.2, 11.9.3