fdo#42771 fdo#44813 fdo#43399 fdo#40261
- Resolves: fdo#42771 Fix crash when loading an invalid .fodt
- Resolves: fdo#44813 make the refresh query filter NULL-safe
- Resolves: fdo#43399 hidden radio button should also gets unset
- Resolves: fdo#40261 Fix crash in XML Form Document