Uncaught TypeError: Cannot read properties of undefined (reading 'aDataSort')

View details in Rollbar: [https://app.rollbar.com/a/jimmy.andrews/fix/item/VariantGrid/6165](https://app.rollbar.com/a/jimmy.andrews/fix/item/VariantGrid/6165)

```

TypeError: Cannot read properties of undefined (reading 'aDataSort')
File "https://shariant.org.au/static/js/lib/datatables/datatables.min.3549c36b1bca.js", line 16, in I
File "https://shariant.org.au/static/js/lib/datatables/datatables.min.3549c36b1bca.js", line 16, in ce
File "https://shariant.org.au/static/js/lib/datatables/datatables.min.3549c36b1bca.js", line 16, in t
File "https://shariant.org.au/static/js/lib/datatables/datatables.min.3549c36b1bca.js", line 16, in HTMLTableElement.
File "https://shariant.org.au/static/js/lib/jquery-3.3.1/jquery-3.3.1.min.a09e13ee94d5.js", line 2, in w.each
File "https://shariant.org.au/static/js/lib/jquery-3.3.1/jquery-3.3.1.min.a09e13ee94d5.js", line 2, in w.fn.init.each
File "https://shariant.org.au/static/js/lib/datatables/datatables.min.3549c36b1bca.js", line 16, in w.fn.init.C [as dataTable]
File "https://shariant.org.au/static/js/lib/datatables/datatables.min.3549c36b1bca.js", line 16, in P.fn.DataTable
File "https://shariant.org.au/classification/classifications", line 45, in filterGrid
File "https://shariant.org.au/classification/classifications", line 152, in HTMLSelectElement.
```

Start at the filterGrid entry point on classification/classifications, then inspect the DataTables setup associated with the classifications page. Reproduce the Rollbar TypeError while loading or filtering the grid and verify that the page no longer throws the aDataSort error.

Written by the indexing model from the issue text.