Fix error "Please select a valid option." on hidden columns, after filter by visible columns

[romanmatyus]

https://github.com/contributte/datagrid/issues/979#issuecomment-915809114

[f3l1x]

LGTM

[f3l1x]

@paveljanda ping

[paveljanda]

Hi, thanks fot the MR. Could you please prepare a sandbox-like repository where I can test both those situations? You can use our datagrid-sandbox for starts: https://github.com/contributte/playground/tree/master/contributte-datagrid

Why am I asking - I am not sure whether it won't break aby back compatibility and also how it will behave with external fitlers.

Thanks a lot!

[f3l1x]

Ping @romanmatyus

[radimvaculik]

Closing as @romanmatyus is not responding.