null values sort as "null"

[mapsandapps]

Null values sort as if they were the string "null" instead of being pushed to the top/bottom of the sort order.

Here's a codepen reproducing the issue.

[ghost]

To avoid it, I "clean" the data list of objects on loading, removing each property which have value null.

Here's same codepen reproducing the solution removing "null properties".

[ckosidow]

This applies to undefined and non-existent fields injected with Angular expressions. It would be nice if these rows moved to the end of the table regardless of direction. I have a large table with a lot of non-existent cells. Sorting by descending is pretty useless for this use case.