Resolve "Error querying an empty table"

Closes #98

added Bug scope::Backend + 1 deleted label

assigned to @mstaudinger

requested review from @mweise

It seems as if the changes for the NonNull attributes are already in dev. Wouldn't it be better to leave Page and PageSize as NonNull?

I also added a deprecated annotation to the query execute - better would be to use save + reexecute as discussed with Andi.

approved this merge request

added 158 commits

• dc322172...13e21da7 - 157 commits from branch dev
• ebd9d8a1 - Merge branch 'dev' into 98-Error-querying-Table

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merged