Fix export dialog interface validation when switching between data formats. Fixes issue #714.
Fix export dialog interface validation when switching between data formats. Fixes issue #714.

dnl-jst/sequelpro,kaneshin/sequelpro,eric-seekas/sequelpro,leichunxin/sequelpro,abhibeckert/sequelpro,abhibeckert/sequelpro,josegonzalez/sequelpro,treejames/sequelpro,dnl-jst/sequelpro,Jellyfrog/sequelpro,treejames/sequelpro,kaneshin/sequelpro,eric-seekas/sequelpro,Jellyfrog/sequelpro,CoolSwitcher/sequelpro,treejames/sequelpro,chenbk85/sequelpro,chenbk85/sequelpro,chenbk85/sequelpro,Jellyfrog/sequelpro,eric-seekas/sequelpro,josegonzalez/sequelpro,eric-seekas/sequelpro,josegonzalez/sequelpro,kaneshin/sequelpro,dnl-jst/sequelpro,CoolSwitcher/sequelpro,kaneshin/sequelpro,CoolSwitcher/sequelpro,chenbk85/sequelpro,leichunxin/sequelpro,josegonzalez/sequelpro,leichunxin/sequelpro,CoolSwitcher/sequelpro,dnl-jst/sequelpro,abhibeckert/sequelpro,treejames/sequelpro,abhibeckert/sequelpro,leichunxin/sequelpro,Jellyfrog/sequelpro