I found this issue experimenting with the -ftrivial-auto-var-init=pattern compile flag.

`get_info()` returns an optional and the value can indeed be `none`. We dereference it to get the value of `n_stats` without checking for the `none` case. It seems like we've been getting zero for `drvinfo->n_stats` in these cases, but it is UB. With -ftrivial-auto-var-init=pattern, the UB became visible - we instead get a large value that causes a very large memory allocation to fail inside `_get_strings`, leading to a server crash.

This change makes us check for `none` and explicitly use 0 in that case, causing us to initialize `_names` to an empty vector inside `_get_strings`, which seems like the correct behavior when we can't get `drvinfo`.