Fix globalActions prevent proper data to load (#85)
Fix globalActions prevent proper data to load (#85)

fixes issue #84, when getData is called on form creation, and before
Datagrid knows filter values, so it load wrong data, users are not abe
to do globalAction properly.

This fix validates data after filter is loaded, but outside of
nette/forms default behaviour.
nextras/datagrid,nextras/datagrid