Return empty doc comment instead of undefined
Return empty doc comment instead of undefined

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