Fix broken check in getUnionType (check was always true)
Fix broken check in getUnionType (check was always true)

nojvek/TypeScript,RyanCavanaugh/TypeScript,SaschaNaz/TypeScript,RyanCavanaugh/TypeScript,Microsoft/TypeScript,alexeagle/TypeScript,microsoft/TypeScript,kitsonk/TypeScript,kitsonk/TypeScript,nojvek/TypeScript,kpreisser/TypeScript,Microsoft/TypeScript,weswigham/TypeScript,SaschaNaz/TypeScript,minestarks/TypeScript,SaschaNaz/TypeScript,alexeagle/TypeScript,microsoft/TypeScript,minestarks/TypeScript,weswigham/TypeScript,nojvek/TypeScript,weswigham/TypeScript,kpreisser/TypeScript,alexeagle/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,minestarks/TypeScript,nojvek/TypeScript,microsoft/TypeScript,Microsoft/TypeScript,SaschaNaz/TypeScript,RyanCavanaugh/TypeScript