Using empty string (“”) as name for ng-app

Question

I wonder why it seems a problem using empty strings for ng-app. In the example provided by w3school, I attempted using empty string to name the ng-app as below, but

Answer 1

you have to set a name to your module, or otherwise not use a module and delete the 'ng-app' from you html.

Answer 2

An empty string null.

But a spaced string is still a string.

Thats why you can use it.