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digitalmars.D.learn - collectExceptionMsg and emptyExceptionMsg

Why does collectExceptionMsg return a special 'emptyExceptionMsg'
string if the exception caught has no message?

string collectExceptionMsg(T = Exception, E)(lazy E expression)

        return cast(string)null;
    catch(T e)
        return e.msg.empty ? emptyExceptionMsg : e.msg;
enum emptyExceptionMsg = "<Empty Exception Message>";

I don't see the purpose of this, why not just return an empty string
literal "" which won't be null?
Apr 18 2012