"class" FsCustomAttribute is not parsed when adding pilots with "Upload FSDB file" option

[jsastreh]

When loading pilots from an existing FSDB, "class" field is not being parsed and glider certification row is missing for all pilot entries.

[biuti]

Aren't they imported as Custom Attribute?
I added a comment to your pull request.

As I wrote, I'd like to populate 'glider_cert' attribute only if all Participants have a valid certification value in class, otherwise import the vale as a CustomAttribute.

I wrote a suggestion as well.