Add validation to filter_and_sort 

If column defined by `sort_by` does not exist on the model being queried, we need to handle this in an elegant fashion.

Currently, this is what happens in this case:

```
line 8, in filter_and_sort
    column = getattr(stmt.column_descriptions[0]["entity"], query_model.sort_by)
AttributeError: type object 'Store' has no attribute 'address'
```