Bug: NULL in a non-used level of hierarchy throws error

[nicholas-masel]

What happened?

If you have a hierarchical path and are executing in anything other than the first level of the hierarchy, you should get a NULL returned for the previous levels that are not going to be used.`

set_autos() is not removing these NULLs before looping through the list, so you end up with an out of bounds error since it is using the length of the list with NULLs included.

> set_autos(null_test$autos)
Error in autos[[i]] : subscript out of bounds

Session Information

n/a

Reproducible Example

I will add this as a test and PR.