What does the hash return?

You should not return anything with that URL , the hash as its name indicates it gets the # and what is after this

Ejm

http://eduard.com  // retorna vacío 
http://eduard.com#hola  // retorna #hola

The value that returns if there is no hash will be an empty string , a way to check the return value would be

var x = window.location.hash;
console.log(typeof x);  // return string

Another thing to keep in mind is that in if the comparison would be with == , that is

if (window.location.hash == ''){... //Sin Hash}