Creating New Family Types with Parameter fro Excel File

I am trying to put together a script to create family types for an existing family by using parameters in an Excel file. This is for Specialty Equipment, specifically lab equipment placeholders that have a number, description, height, depth, and width. Part of the issue I am encountering is that mixed in with this equipment are Owner provided items that have no value for height, depth, and width. These are items like laptops and other movable table-top items. The script produces null values at these indices. Is there a way to account for these null values, so that the the script can continue to create types and skip over these null values.

I have attached my progress so far.

Any help would be greatly appreciated.

CC Create Family Types From Excel.dyn (30.8 KB)