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Polish schema example.
Friedemann Kleint authored
Add some error handling, fix warning on startup:

QIODevice::read: device not open

caused by MainWindow::schemaSelected(0) which clears the
instance combo causing the current index to temporarily
change to -1.

Change-Id: I213d68b07b2dee4e2bbc1404aaf149ce7c189713
Reviewed-by: default avatarJoerg Bornemann <joerg.bornemann@digia.com>
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