How to display placeholders in AngularJS for undefined expression values?

Question

If I have an expression {{ x }} and x is undefined or null, then how can I display a placeholder for it?

I provided one solution

Answer 1

I do it with ng-show, like this:

{{username}}
N/A

Sure, it adds a lot more elements to my view that I might be able to handle differently. I like though how easy it is to clearly see where my placeholder/empty values are, and I can style them differently as well.